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Mikhail_lewis Samba Member
Joined: October 29, 2017 Posts: 40 Location: Peachland British Columbia Canada
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Posted: Thu Nov 02, 2017 7:31 am Post subject: 1968 vw beetle woody brake bleeding |
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Ive primed the new master cylinder. Ive replaced brake pistons on all drums and installed new pads and new brake line hoses on the front.
I am getting very little liquid. I now started to get pressure on the actual brake pedal. I have pressure vacuum hand pump with bleeder kit. Me and my old man have been going at this for a while now on the driveway. And now it is -5 with lots of snow in calgary alberta.
What am i doing wrong? We had same problem on my last beetle 8 years ago. We eventually surrendered it to a shop and they got it done, but it took them a very long time too.
anyone local in calgary able to help out in cold weather? Od rather figure the problem out and how to do it myself for next time if anyone csn give me pointers... i want to drift my woody in the snow😍
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sb001 Samba Member
Joined: May 19, 2011 Posts: 10406 Location: NW Arkansas
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Posted: Thu Nov 02, 2017 8:24 am Post subject: Re: 1968 vw beetle woody brake bleeding |
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What order are you bleeding the brakes in?
Common practice is to bleed starting farthest away from MC and ending with closest. So this would be: Rear right, rear left, front right, front left.
Doing it another way may not be getting all the air out of the system. _________________ I'm the humblest guy on this board.
1969 autostick sedan, family owned since new
1600 SP engine
Solex 30 PICT 3 carburetor
Bosch 113905205AE autostick distributor |
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bluebus86 Banned
Joined: September 02, 2010 Posts: 11075
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Posted: Thu Nov 02, 2017 10:12 am Post subject: Re: 1968 vw beetle woody brake bleeding |
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if fluid is not flowing well, it could be the four flexible hoses near each wheel have become internally restricted. what happens is just like what hallens with blood vessels, as the hose ages, the inside can clog, internally swelling, the exterior of the hose may all appear just fine, but inside is reduced to a pin hole diameter.
You may have to replace the hoses, they are a consumable item, after decades of use, they can fail like this.
remove a hose from the wheel that your not getting flow from, and look inside, can you easily pass a straightened coat hanger wire thru it with ease, can you easily blow air thru it? if not, replace all four, under the assumption that there are all the same age.
also you may wish to use the two person pump the peddle method of brake flushig, it is highly effective, and should eliminate the possibility of the power bleeder not working right. , maybe some thing is wrong with it?
anyway give the hoses consideration, as if they are restricted internally, they will produce the symptom you discribe.
good luck, stop sure,Bug On!
note with restricted hoses, they can sometimes act like a check valve, and result in dragging brakes when ylu step on the brakes, you develop high lressure which will force some fluid thru the restriction as the hose bulges, but when you release the peddle, the only force to send the fluid backwards to the master is the tiny springs in the brake drum, and they dont have near the force of your foot, so the fluid does not flow back, or flows back very slow, hence you brakes drag a bit. the hose kind of becomes a one way or check valve.
I have replaced clogged, restricted hkses that looked lerfectly fine on the outside, but had a massive restriction inside.
also a hint, use brake system compatible brake grease, or paste as it is sometimes called on the bleeder screw threads, tnis will help prevent them from rusting stuck for the next time you flush the brakes, this js the same brake system co parible grease you used on the piston rubber seals when you rebuilt the cylinders. but only ise grease or paste specified for use on brake rubber internal larts, other greases can ruin the rubber bits, even in trace amounts.
good luck, Bug On! _________________ Help Prevent VW Engine Fires, see this link.....Engine safety wire information
Stop introducing dirt into your oil when adjusting valves ... https://www.thesamba.com/vw/forum/viewtopic.php?t=683022 |
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calvinater Samba Member
Joined: September 06, 2014 Posts: 3333 Location: 802 The Pointless Forrest
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Posted: Thu Nov 02, 2017 3:04 pm Post subject: Re: 1968 vw beetle woody brake bleeding |
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more pics of the woody please _________________ "Albatross"! |
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vwoldbug Samba Member
Joined: January 28, 2009 Posts: 1214 Location: Ohio
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Posted: Thu Nov 02, 2017 4:53 pm Post subject: Re: 1968 vw beetle woody brake bleeding |
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You say new pads does it have disc brakes and how did you prime master cylinder |
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andk5591 Samba Member
Joined: August 29, 2005 Posts: 16757 Location: State College, PA
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Posted: Thu Nov 02, 2017 5:55 pm Post subject: Re: 1968 vw beetle woody brake bleeding |
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Lets first get terminology straight to avoid confusion. Assuming you have drum brakes all around. If so, then the wheel cylinder is what actuates the brakes. Then you have brakes shoes and not pads.
You replaced the master, the wheel cylinders and the soft lines in the front. You bench bled the master.
First thing is to adjust the shoes to be dragging or some folks actually like to have them tight for bleeding. I bleed the fronts first, then the rears. Then go back around a couple times. You can use your vacuum pump to get fluid into the wheel cylinders, but I have never been able to completely bleed with it.
If you have a helper, use a hose and bottle with the bottle higher than the bleeder. Have them work the pedal 3 or 4 times, then push hard and hold it down. Crack the bleeder for a few seconds to get some fluid and hopefully air out (watch the hose for bubbles). Do that wheel until no more air. Check the reservoir fluid level and go to the next wheel until you go the whole way around. Readjust the brake shoes and go all around a couple more times. _________________ D-Dubya Manx clone - 63 Short pan,1914.
Rosie 65 bug - My mostly stock daily driver.
Woodie 69 VW woodie (Hot VWs 7/12).
"John's car" 64 VW woodie - The first ever
Maxine 61 Cal-look bug - Cindy's daily driver.
Max - 73 standard Beetle hearse project - For sale
66 bug project - Real patina & Suby conversion
There's more, but not keeping them... |
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heimlich VWNOS.com
Joined: November 20, 2016 Posts: 6622 Location: Houston, Texas
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Posted: Fri Nov 03, 2017 8:30 pm Post subject: Re: 1968 vw beetle woody brake bleeding |
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I always use the two person method. I never bend bleed the master. I either start from the point furthest the master or the closest. Since I don't remember it must not really matter but the Bentley does tell you which is best.
I redid my rear brakes once and couldn't get all the air out. I found out I needed to replace the master. I replaced the master and tried to bleed my brakes and found out the rear cylinders I replaced pushed the pads to far out which caused them to stick which then caused the cylinders to protrude out and at an angle. This let air in and out of the system. Anything and everything is possible.
Divide the system into two, front and rear. Check if you can bleed the fronts. The go for the rears. If you can't bleed the rears start checking on that end. If it is the rear (or front) is this the end that you didn't change the tubes? Maybe they need it. Inspect them for rot and cracks. Even if there isn't any they may still be bad on the inside.
If it is the rears giving you problems pull the drum off and check the pads and cylinders. You have to rub a little grease on the inside where the pad hits. Take pictures of these areas and post them here so we can check if the springs/etc are correct. _________________ www.vwnos.com [email protected]
Classic Brands. Classic Quality.
Not all parts are made the same. NOS OE/OEM parts made mainly in West Germany, Early Germany, and Early Brazil are where VW produced the best quality parts and best fitting products.
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Brian Samba Moderator
Joined: May 28, 2012 Posts: 8340 Location: Oceanside
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Posted: Fri Nov 03, 2017 9:25 pm Post subject: Re: 1968 vw beetle woody brake bleeding |
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If it's a new master, triple check the pedal free play. _________________ Wash your hands
'69 Bug
'68 Baja Truck
'71 Bug
'68 Camper
Only losers litter |
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Mikhail_lewis Samba Member
Joined: October 29, 2017 Posts: 40 Location: Peachland British Columbia Canada
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Posted: Sat Nov 04, 2017 8:17 am Post subject: Re: 1968 vw beetle woody brake bleeding |
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andk5591 wrote: |
Lets first get terminology straight to avoid confusion. Assuming you have drum brakes all around. If so, then the wheel cylinder is what actuates the brakes. Then you have brakes shoes and not pads.
You replaced the master, the wheel cylinders and the soft lines in the front. You bench bled the master.
First thing is to adjust the shoes to be dragging or some folks actually like to have them tight for bleeding. I bleed the fronts first, then the rears. Then go back around a couple times. You can use your vacuum pump to get fluid into the wheel cylinders, but I have never been able to completely bleed with it.
If you have a helper, use a hose and bottle with the bottle higher than the bleeder. Have them work the pedal 3 or 4 times, then push hard and hold it down. Crack the bleeder for a few seconds to get some fluid and hopefully air out (watch the hose for bubbles). Do that wheel until no more air. Check the reservoir fluid level and go to the next wheel until you go the whole way around. Readjust the brake shoes and go all around a couple more times. |
Your terminology is correct. I have been doing it the way you describe for the most part. Will check shoes for how much drag is on them in the drum |
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andk5591 Samba Member
Joined: August 29, 2005 Posts: 16757 Location: State College, PA
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Posted: Sat Nov 04, 2017 11:28 am Post subject: Re: 1968 vw beetle woody brake bleeding |
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Also - the post about pedal free play is VERY important. Pedal should move about 1/2" before you feel the pushrod hit the disc in the master. _________________ D-Dubya Manx clone - 63 Short pan,1914.
Rosie 65 bug - My mostly stock daily driver.
Woodie 69 VW woodie (Hot VWs 7/12).
"John's car" 64 VW woodie - The first ever
Maxine 61 Cal-look bug - Cindy's daily driver.
Max - 73 standard Beetle hearse project - For sale
66 bug project - Real patina & Suby conversion
There's more, but not keeping them... |
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Zundfolge1432 Samba Member
Joined: June 13, 2004 Posts: 12468
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Posted: Sat Nov 04, 2017 2:16 pm Post subject: Re: 1968 vw beetle woody brake bleeding |
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kawfee wrote: |
I always use the two person method. I never bend bleed the master. I either start from the point furthest the master or the closest. Since I don't remember it must not really matter but the Bentley does tell you which is best.
I redid my rear brakes once and couldn't get all the air out. I found out I needed to replace the master. I replaced the master and tried to bleed my brakes and found out the rear cylinders I replaced pushed the pads to far out which caused them to stick which then caused the cylinders to protrude out and at an angle. This let air in and out of the system. Anything and everything is possible.
Divide the system into two, front and rear. Check if you can bleed the fronts. The go for the rears. If you can't bleed the rears start checking on that end. If it is the rear (or front) is this the end that you didn't change the tubes? Maybe they need it. Inspect them for rot and cracks. Even if there isn't any they may still be bad on the inside.
If it is the rears giving you problems pull the drum off and check the pads and cylinders. You have to rub a little grease on the inside where the pad hits. Take pictures of these areas and post them here so we can check if the springs/etc are correct. |
According to Bentley it matters. The single circuit that’s everything up to 66 starts from furthest working to nearest. Beginning in 67 U.S. models got dual relief and it’s actually a good thing safety wise.
Dual relief starts with front passenger then driver then rear pass then driver side. Most often overlooked people ignore the flex lines and the free play adjustment at master cylinder.
As for bench bleeding it’s not in the manual because it wasn’t needed then, what were those stupid Germans thinking? |
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neil68 Samba Member
Joined: March 17, 2007 Posts: 3440 Location: Calgary, Canada
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Posted: Sat Nov 04, 2017 11:30 pm Post subject: Re: 1968 vw beetle woody brake bleeding |
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Zundfolge1432 wrote: |
According to Bentley it matters. Beginning in 67 U.S. models got dual relief and it’s actually a good thing safety wise. Dual relief starts with front passenger then driver then rear pass then driver side. As for bench bleeding it’s not in the manual because it wasn’t needed then, what were those stupid Germans thinking? |
Ditto. I follow the Bentley manual as well, starting with front passenger, then front driver, rear passenger, rear driver. Bench bleeding is not needed if you have the stock fluid reservoir up beside the speedo. _________________ Neil.
Der Kleiner Rennwagens
68 Beetle 2332 cc, 204 WHP
12.5 seconds @ 107 mph
Dynojet Test: https://www.youtube.com/watch?v=M9B_H3eklAo |
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andk5591 Samba Member
Joined: August 29, 2005 Posts: 16757 Location: State College, PA
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Posted: Sun Nov 05, 2017 11:04 am Post subject: Re: 1968 vw beetle woody brake bleeding |
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neil68 wrote: |
Zundfolge1432 wrote: |
According to Bentley it matters. Beginning in 67 U.S. models got dual relief and it’s actually a good thing safety wise. Dual relief starts with front passenger then driver then rear pass then driver side. As for bench bleeding it’s not in the manual because it wasn’t needed then, what were those stupid Germans thinking? |
Ditto. I follow the Bentley manual as well, starting with front passenger, then front driver, rear passenger, rear driver. Bench bleeding is not needed if you have the stock fluid reservoir up beside the speedo. |
Have never bench bled a master..never had the need. And FYI - I broke down and bought a Motive Power Bleeder recently ad just used it yesterday when I replaced a leaking wheel cylinder. I think I am gonna like it. _________________ D-Dubya Manx clone - 63 Short pan,1914.
Rosie 65 bug - My mostly stock daily driver.
Woodie 69 VW woodie (Hot VWs 7/12).
"John's car" 64 VW woodie - The first ever
Maxine 61 Cal-look bug - Cindy's daily driver.
Max - 73 standard Beetle hearse project - For sale
66 bug project - Real patina & Suby conversion
There's more, but not keeping them... |
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