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brake pedal keeps going stiff??
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leeb130

Posted: Wed Dec 28, 2011 5:23 pm

Joined: May 22, 2011
Posts: 7
Trade Rating: 0
Location: Doncaster

hey everyone, problem im having recently is when braking the pedal becomes stiff, and brakes arent as effective, this only happens occasionally. If i release the pedal then press again its soft again seems to be getting more frequent. had a search but couldnt find a definitive answer cars a 1.6 xs 2000 Any idea what could be causing this? thanks in advance lee


	Leeb130

Rob2859

Posted: Wed Dec 28, 2011 5:31 pm

Joined: Mar 29, 2010
Posts: 3977
Trade Rating: +15
Location: Halifax

It sounds like a loss of vacuum pressure. Not sure if an air-lock could cause it.

dumdum0910

Posted: Wed Dec 28, 2011 11:29 pm

Joined: Apr 09, 2011
Posts: 445
Trade Rating: +1
Location: letchworth

i get this now and then aswell. still havent found the problem . i have no airleaks and the master cylider is fine.


	if it dont scuff the ruff it aint low enuf

dumdum0910

Posted: Wed Dec 28, 2011 11:29 pm

Joined: Apr 09, 2011
Posts: 445
Trade Rating: +1
Location: letchworth

i get this now and then aswell. still havent found the problem . i have no airleaks and the master cylider is fine.


	if it dont scuff the ruff it aint low enuf

Deckchair5

Posted: Thu Dec 29, 2011 2:34 am

Joined: Aug 01, 2011
Posts: 390
Trade Rating: 0
Location: Bath UK

Sounds like brake servo
When you turn the engine off then pump the brake pedal. For the first few pumps it should feel normal and then there will be no vacuum remaining and the pedal will go solid, probably action the brakes higher up. If this is what you feel/ experience when the fault occurs then you know what you're looking for eg loss of vacuum or servo fault

I'd check for damage or weakness in the side walls in engine to servo vacuum pipe as it can crush with the vacuum. Servo has plastic check valve so I'd check that out. After that then it's checking with a vacuum pump and gauge to see if it can hold vacuum

Some diesels have their own vacuum pump

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