Brake bleeding help

[thedkidhd]

I just installed a new master cylinder in my 69. I cant get fluid to the rears and have no pedal pressure. Please help susposted to head out to a show tomorrow

[bluebus86]

Assure master pushrod is correct length, adjust as needed, there MUST be freeplay. Assure rear shoes are adjusted prior to bleeding. Assure rear hoses are not block, they can with age swell internally. make sure bleeder valves are not clogged, remove them to inspect. make sure the metal pipe that runs along tunnel on driver side floor pan, and under rear seat has not ruptured and leaking, thus filling the pan under the floor matts with fluid. they have been known to rust out. lift floor matts to inspect also assure the fluid reservoir hose to rear master fitting is not blocked, kinked.

Good luck

Bug On!

ps also assure master is not defective, loosen the rear pipe fitting on the master and assure fluid comes out when pumped, if not, then for sure check pushrod for end play, if that is good, with proper endplay, then you may have a bad master. you can loosen fitting at hoses at wheels and test if fluid comes out too, do upstream side, if you get flow, then try down stream side.
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[thedkidhd]

Fluid comes out of the back master hole so that's ok. And the has movement before it hits the push rod so it letting it come back all the way

[Q-Dog]

You brake shoes are too loose. 95% of the time the issue is, the shoes are too loose.
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Brian

'69 Dune Buggy
'69 Beetle Convertible
'70 Beetle

[heimlich]

Tighten all 8 star nuts so the wheels don't move. Then run around the car twice bleeding.
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[Eric&Barb]

If it is still dual circuit MC, you need to bleed the fronts first.

Definitely full lock each shoe to the drums to get it to bleed.

Do not slam pedal, that makes big bubbles int he fluid turn into tiny hard to bleed bubbles.
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[Rayfield]

Trying to get something resembling brakes on my '75, and got to this thread during my searching. I replaced the MC with a dual circuit (this one: https://www.amazon.com/gp/product/B001PYTNTE/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1). My reading seems to indicate that with a dual, you start with the fronts; I can't get anything resembling a good bleed of fluid out:

Gravity - Fluid will come out for a bit, then it's just air, with the reservoir full up. The reservoir is pretty high up in a '75, so I would have expected this to work ok to get me started.

Vacuum - I bought a cheap vacuum bleeder, but I'm not convinced it seals very well around the bleeder screw. Same story, it will suck out a bit of fluid, and then there's just air in the line coming off the screw.

One-Man-Bleed Kit - I put a hose on that seems fairly tight on the screw, loosen it a quarter to a half turn, and pump the brake pedal a few times. I got some fluid when I first started, then it's all air.

The MC was bench bled using this procedure: http://www.vw-resource.com/alternate.html before I mounted it. But I'm wondering if it's a cheap piece of crap. I see fluid around the top, where the input hoses from the reservoir go in.

One thing I haven't done is something people talk about in this thread, which is to lock my shoes tight to the drum. I don't remember having to do this in the past to get a good bleed, but I'm not having a lot of luck otherwise!

Any thoughts?

[Eric&Barb]

[Rayfield]

[Eric&Barb]

[Rayfield]

Ok, thanks. Yep, new brake hardware all the way around, so I'll keep that in mind.

[VW_Jimbo]

[Rayfield]

It's a good thought, I'll need to find a writeup for doing that. The car came to me in pieces, I have no idea if the push rod is set up correctly or not.

[Michael Ambrozik]

Did you bench bleed the MC before installing it in the car? First step in replacing a MC.

[Cusser]

[Rayfield]

[Eric&Barb]

[VW_Jimbo]

Here you go!

FWIW. I have never had to “ lock up” the shoes, to bleed the brakes. But I gravity bleed them first. No reason working hard! Fill the reservoir and open up 1 bleeder and wait. It will start dripping soon! While waiting, I will typically go work on some other part of the car. Easy! Once you get fluid out one side, move to the next side!
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Jimbo

There is never enough time to do it right the first time, but all the time necessary the second time!

[Rayfield]

Ah, ok, makes sense. I keep thinking of the front and rear as completely separate stuff, but the pedal is connected to both, isn't it..

[Rayfield]

Thanks!