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slik
Samba Member
Joined: April 18, 2012
Posts: 216
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 Posted: Fri Apr 17, 2015 8:15 pm Post subject: Bang sound when applying brakes |
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| When I back my bug up in reverse and stop, there's a loud bang sound as if something shifts. At first I thought I didn't turn the lock handle on the hood and the hood was just banging but that's not it. Could it be a brake? The wheels seem very stable. The sound comes from the rear for sure. Any ideas? |
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Dr OnHolliday
Samba Member
Joined: May 11, 2012
Posts: 1215
Location: was Escondido now San Berdoo
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| Posted: Fri Apr 17, 2015 8:41 pm Post subject: |
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This is when you get dirty crawling around under the car inspecting it, and disassembling suspect components....
_________________
1965 Type 1 sunroof Baja / about 70k miles on self-rebuilt '74 1600 and counting / SP heads and aftermarket valve keepers / non-doghouse shroud with external cooler and filter / 1.5 qt extended sump / Weber 32/36 DFAV progressive carb / 009 dist with Pertronix / 1.25 ratio rockers and ball adjusters / 1.5" stainless steel J-pipes and carbon steel baja exhaust |
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slik
Samba Member
Joined: April 18, 2012
Posts: 216
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| Posted: Fri Apr 17, 2015 8:48 pm Post subject: |
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| Haha. I've been getting dirty every night after work and smiling the whole time! Was just wondering if it was a common thing someone had run in to. Will keep investigating. Bugs r so fun. It's like therapy working on them. |
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Dr OnHolliday
Samba Member
Joined: May 11, 2012
Posts: 1215
Location: was Escondido now San Berdoo
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| Posted: Fri Apr 17, 2015 10:07 pm Post subject: |
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That being said, the first place I'd look is the transaxle mounts, especially the front one. Is this IRS?? Then I'd go after the axles....
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1965 Type 1 sunroof Baja / about 70k miles on self-rebuilt '74 1600 and counting / SP heads and aftermarket valve keepers / non-doghouse shroud with external cooler and filter / 1.5 qt extended sump / Weber 32/36 DFAV progressive carb / 009 dist with Pertronix / 1.25 ratio rockers and ball adjusters / 1.5" stainless steel J-pipes and carbon steel baja exhaust |
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slik
Samba Member
Joined: April 18, 2012
Posts: 216
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| Posted: Sat Apr 18, 2015 4:18 am Post subject: |
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| Dr OnHolliday wrote: |
| That being said, the first place I'd look is the transaxle mounts, especially the front one. Is this IRS?? Then I'd go after the axles.... |
thanks will do. And yes it is. At least I think so. I thought all bugs were irs. |
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Bret2094
Samba Member
Joined: March 22, 2012
Posts: 665
Location: Linden, Texas or College Station Texas
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| Posted: Sat Apr 18, 2015 4:27 am Post subject: |
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| slik wrote: |
| I thought all bugs were irs. |
No, prior to 68 all were swing axle . Irs sort of happened in 68 with the introduction of the autostick, but swing axle was offered also that year. In 69, Irs was the dominant axle setup offered by VW at least in the US. Mexico ran swing axle pretty much throughout the rest of their production.
Not trying to be an ass, but do you know the difference? go look under your bug when you get a chance. If you see axles with 2 rubber boots per axle side, then it's IRS. If you only have boots covering the axle where it meets the transmission, then you have a swing axle setup.
What year car is it anyway?
Bret
_________________
1959 baja beetle ragtop( going back to Full body)
1959 beetle
1960 Beetle frame Custom buggy
1962 Karmann Ghia
1967 beetle( august 66, first car)
1967 beetle (parts car)
1977 Westfalia Camper
1972 Plymouth Duster
Just another 22 year old jackass who caught the bug, and lives by the motto " NO fatchicks allowed" , I've got too many cars as is (buses N/A) |
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drscope
Samba Member
Joined: February 19, 2007
Posts: 15273
Location: Baltimore, Maryland USA
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| Posted: Sat Apr 18, 2015 6:58 am Post subject: |
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Pull the rear wheels off and look carefully at the spring plates where the axle is held with the 3 big bolts. Look for any signs of movement in the dirt and crud on the spring plate right where the axle is mounted.
It may be that one side has come a little loose and is allowing the axle to rotate under pressure. When you back up and step on the brake, it would suddenly rotate in one direction. Then as you drive off, torque would rotate it in the other direction but you may not be hearing it then.
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Mother Nature is a Mean Evil Bitch! |
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slik
Samba Member
Joined: April 18, 2012
Posts: 216
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| Posted: Sat Apr 18, 2015 3:34 pm Post subject: |
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| Bret2094 wrote: |
| slik wrote: |
| I thought all bugs were irs. |
No, prior to 68 all were swing axle . Irs sort of happened in 68 with the introduction of the autostick, but swing axle was offered also that year. In 69, Irs was the dominant axle setup offered by VW at least in the US. Mexico ran swing axle pretty much throughout the rest of their production.
Not trying to be an ass, but do you know the difference? go look under your bug when you get a chance. If you see axles with 2 rubber boots per axle side, then it's IRS. If you only have boots covering the axle where it meets the transmission, then you have a swing axle setup.
What year car is it anyway?
Bret |
Your not being an ass. I know just enough to get me in trouble. My bug is an almost rust free 63 out of bakersfield CA. It has some surface rust but the body is solid and the metal on the interior almost looks brand new in areas. I bought it a few years back and then I got injured. Starting to work on it now. Ok I will look the boots |
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slik
Samba Member
Joined: April 18, 2012
Posts: 216
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| Posted: Sat Apr 18, 2015 3:36 pm Post subject: |
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| drscope wrote: |
Pull the rear wheels off and look carefully at the spring plates where the axle is held with the 3 big bolts. Look for any signs of movement in the dirt and crud on the spring plate right where the axle is mounted.
It may be that one side has come a little loose and is allowing the axle to rotate under pressure. When you back up and step on the brake, it would suddenly rotate in one direction. Then as you drive off, torque would rotate it in the other direction but you may not be hearing it then. |
Thanks. Weird thing is I swear I only just started hearing it after I removed and replaced the driver rear wheel to put my fuel filter back there. Could I have dislodged it then when a i had forcefully get the lugs of the wheel? I don't think that would do it though. That's nothing compared to hitting bumps in the road etc. |
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mukluk
Samba Member
Joined: October 18, 2012
Posts: 7452
Location: Clyde, TX
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| Posted: Sat Apr 18, 2015 5:58 pm Post subject: |
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Silly question, but have you checked to make sure you don't have something rolling around under or behind the back seat?
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1960 Ragtop w/Semaphores "Inga" |
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slik
Samba Member
Joined: April 18, 2012
Posts: 216
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| Posted: Sat Apr 18, 2015 7:14 pm Post subject: |
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| mukluk wrote: |
| Silly question, but have you checked to make sure you don't have something rolling around under or behind the back seat? |
good question but my inside is stripped clean. No seat in the back n bare metal. But that's what it sounds like. As if something slides and bangs. I'll look closer tomorrow. Thanks. |
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iowegian 
Samba Curmudgeon
Joined: February 16, 2005
Posts: 9945
Location: Somewhere between Dubuque and Keokuk
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| Posted: Sat Apr 18, 2015 7:47 pm Post subject: |
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| slik wrote: |
| drscope wrote: |
Pull the rear wheels off and look carefully at the spring plates where the axle is held with the 3 big bolts. Look for any signs of movement in the dirt and crud on the spring plate right where the axle is mounted.
It may be that one side has come a little loose and is allowing the axle to rotate under pressure. When you back up and step on the brake, it would suddenly rotate in one direction. Then as you drive off, torque would rotate it in the other direction but you may not be hearing it then. |
Thanks. Weird thing is I swear I only just started hearing it after I removed and replaced the driver rear wheel to put my fuel filter back there. Could I have dislodged it then when a i had forcefully get the lugs of the wheel? I don't think that would do it though. That's nothing compared to hitting bumps in the road etc. |
Are those lug nuts tight?
How about the axle nut? (that's the real big one that holds the brake drum to the axle) |
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slik
Samba Member
Joined: April 18, 2012
Posts: 216
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| Posted: Sun Apr 19, 2015 5:03 am Post subject: |
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| iowegian wrote: |
| slik wrote: |
| drscope wrote: |
Pull the rear wheels off and look carefully at the spring plates where the axle is held with the 3 big bolts. Look for any signs of movement in the dirt and crud on the spring plate right where the axle is mounted.
It may be that one side has come a little loose and is allowing the axle to rotate under pressure. When you back up and step on the brake, it would suddenly rotate in one direction. Then as you drive off, torque would rotate it in the other direction but you may not be hearing it then. |
Thanks. Weird thing is I swear I only just started hearing it after I removed and replaced the driver rear wheel to put my fuel filter back there. Could I have dislodged it then when a i had forcefully get the lugs of the wheel? I don't think that would do it though. That's nothing compared to hitting bumps in the road etc. |
Are those lug nuts tight?
How about the axle nut? (that's the real big one that holds the brake drum to the axle) |
u know what? It just occurred to me that I tightened the lug nuts with my new harbor fright torque wrench. Seeing as how my fuel pressure gauge was a piece of crap from there maybe the dam lugs r not tight. I know it sounds stupid and I really am not that dumb with stuff like this but I'll check to see that too. |
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KTPhil
Samba Member
Joined: April 06, 2006
Posts: 35900
Location: Conejo Valley, CA
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| Posted: Sun Apr 19, 2015 8:52 am Post subject: |
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Strictly speaking, all bugs have IRS. Independent rear suspension in which movement of one wheel does not cause movement in the other. This is in contrast to a solid rear axle on most older Amrican cars and today's pickup trucks.
However, when vW redesigned the rear axles too use two constant velocity joints instead of a swing axle pivoting only at the center, the term "IRS" got associated with it incorrectly. The name stuck and so today the term "IRS" for VWs usually means "double jointed rear suspension."
So your statement that all VWs are IRS is correct but misleading in light of the popular shorthand jargon. |
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