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Old 05-09-18, 17:52
lordtets lordtets is offline
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Location: Manchester
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T4 Post Icon clunk when light braking and then loss of pedal

Had a bit of an odd one on my home tonight

Pulling up slowly at some lights and there was a clunk (like i'd run over something or a large stone had hit the floor). I think the pedal jumped at the same time. stopped ok then thought nothing and carried on - van stopped fine and at the next set of lights and the following 2 junctions. Got home and pulled up outside and as i had just about stopped the pedal hit the floor and no brakes!

Managed to get it on the drive and have a look but can't see anything - I have the pedal strengthener fitted so not that. No leaks and everything looks "ok" on inspection. Got in and the pedal is hard again!!

Really bizarre one. For obvious reasons i'm not driving it until I can find the problem but this being my first T4 wondered if anyone has had the same problem.

Jus done 2000 miles round France and 600 to Scotland without any problems at all so not something thats got worse over time - very sudden.

It's a 1999 T4 2.5 TDi 102

thanks in advance
Steve
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  #2  
Old 18-10-18, 16:24
JonCa JonCa is offline
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Default Re: clunk when light braking and then loss of pedal

Didn't think there was a pedal strengthener on the brakes.
If there is no fluid loss I'd be checking the mechanical connections first. Brake pedal to servo arm, is it still firmly connected and not floating around.
Servo vacuum pipe connected and hose not leaking
Then I suppose its down to checking each wheel in turn but if there is nothing to see well.

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  #3  
Old 22-10-18, 18:10
lordtets lordtets is offline
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Default Re: clunk when light braking and then loss of pedal

I fitted the strengthener when I got it as they are a known weakness. I've put it down to the master cylinder - tried it again the other day and while sat on the drive with the engine running the pedal had very little resistance and went to the floor. Problem I now have is there are various master cylinders for my van and when I put the number in I get more than one option.
Pics attached hopefully!!
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Old 22-10-18, 20:11
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Dixon Dixon is offline
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Default Re: clunk when light braking and then loss of pedal

I had something similar on my old T4, it was the brake pad material had come away from the rest of the pad. I had a big clunk as the 2 separated and lost pedal, I pumped it and it came back. By the time I nursed it home the material stopped rattling as it disintegrated.
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