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Posted

So I got myself a van, pretty solid, run well, high miles but that's to be expected really overall in good shape

 

However

 

I started having problems with the brakes.....

 

What's happening? Well

 

The brake pedal goes solid, like there is a lot of pressure ( something like if you pump the pedal when it's not running and it goes hard), and the brakes won't work without really having to shove the pedal down.

When this happens there is also a hell of a grinding noise, brakes work again with a good shove, but this can go on for about 5 mins before going back to normal. This has started to affect the other pedals too, as now they vibrate when setting off in 1st & 2nd, all the pedals vibrate at a certain point and there is a sort of grinding spinning noise coming from where I think the servo is behind the dash

Usually only happens when vans been parked up for a few days as it's realy only used at weekends for my mobile disco

It's a pretty serious problem, and I could really use some help diagnosing!

 

Been advised it could be the servo, servo seals, slave cylinder or the Fkn and pump, it's a strange problem! And any help would be greatly appreciated!

 

Van is a 2005 relay MWB high top, 2.0l hdi engine with most of the service history an good mots, got van in November with a years test got 180.000 ish on the clock. Any ideas?? Apart from scrap it..... Can't really afford that!

Thanks!

Posted

Welcome to the forum.

 

Possibilities could include the servo, the hose to the servo, the vacuum pump (leaking/broken drive lug), a non return valve on the servo hose where it connects to the servo, seized brakes needing a clean, a brake hose problem, the cross shaft from the brake pedal to the servo seized bearings - if there is one.

 

The servo you can check to see if the pedal is pumped so it goes hard and then if it goes soft/further down when the engine is started. The servo seals/non return valve might be checked since it ought to maintain vacuum in the servo after the engine is stopped, so if the pedal is used some time after stopping the engine it takes a few pushes for the pedal to go hard.

 

The vacuum pump should not be noisy or have any signs of oil leakage - listen to it when the noise appears. It is located on the gearbox end of the cylinder head.

  • 3 weeks later...

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