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Curious brake problem
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tootype2crazy
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Location: St. Louis Missouri
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PostPosted: Fri May 24, 2013 7:04 pm    Post subject: Curious brake problem Reply with quote

I've searched and I'm certain it's the servo, but I thought I would post this just to get confirmation and share this problem if others have it. My brakes work perfectly all the time except above an ambient temperature of 90 degrees. I have replaced every single component on the system except the proportioning valve and the servo. I have cleaned and greased the brake pedal pivot and put a new return spring in. When it gets above the said temperature the brake pedal will not return and I have to pull it up with my toe. Cool or freezing weather everything is great, but above 90 the problem is persistent and quite annoying. Thoughts?
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1978 Sunroof Deluxe Bus (daily driver)
1978 Transporter (mom's, making into a camper)
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airschooled
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PostPosted: Fri May 24, 2013 7:16 pm    Post subject: Reply with quote

Do your brakes drag along with the pedal not returning?
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busdaddy
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PostPosted: Fri May 24, 2013 7:23 pm    Post subject: Reply with quote

Try disconnecting the servo hose from the plenum (cap the nipple on the engine) and see if it still does it, beware!, the brakes will require more effort to stop but if it cures the problem a booster rebuild is in your future.

How much freeplay is in the pedal pushrod?
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tootype2crazy
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PostPosted: Fri May 24, 2013 7:27 pm    Post subject: Reply with quote

asiab3 wrote:
Do your brakes drag along with the pedal not returning?


Nope

busdaddy wrote:
Try disconnecting the servo hose from the plenum (cap the nipple on the engine) and see if it still does it, beware!, the brakes will require more effort to stop but if it cures the problem a booster rebuild is in your future.


I suppose that is the ultimate test. This has been a persistent problem as the PO had a crappy hose clamp/hardware store spring solution set up on it. I will try that tomorrow and report in. Edit: The temperature tomorrow is not forecast to be high enough so I'll have to wait until it gets hot. In Saint Louis that can happen in one day though.
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air-cooled or nothing for me
1978 Sunroof Deluxe Bus (daily driver)
1978 Transporter (mom's, making into a camper)
1970 Single Cab 2.1 turbo/EFI 6 Rib, 78 front beam, vanagon backing plates on rear (project)
2001 GTI VR6 (wife's)
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Hoody
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PostPosted: Sat May 25, 2013 12:28 am    Post subject: Reply with quote

Well there ya go. You have air in a sytem that you shouldn't.
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