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Old 29-08-09, 10:46
Chucklebus Chucklebus is offline
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Default Intermittent stiff brake pedal and poor braking

I've got an intermittent problem with the brakes. This is what happens.... when I press the pedal when first braking it brakes ok. Then if I need to brake again within a few seconds, the brake pedal goes very stiff and the van brakes very poorly as if i'm getting no assistance from the servo. Then 30 seconds-ish later it's ok again for the first braking, and then stiff afterwards. Any ideas please?
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Old 29-08-09, 11:08
wind welder wind welder is offline
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Default Re: Intermittent stiff brake pedal and poor braking

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Originally Posted by Chucklebus View Post
I've got an intermittent problem with the brakes. This is what happens.... when I press the pedal when first braking it brakes ok. Then if I need to brake again within a few seconds, the brake pedal goes very stiff and the van brakes very poorly as if i'm getting no assistance from the servo. Then 30 seconds-ish later it's ok again for the first braking, and then stiff afterwards. Any ideas please?
Hi,

What engine do you have?

If it's a 2.4L 2.5L then it sounds like the vacuum pump has passed it's sell by date.

Has it been, or is it still tapping when ticking over. If so get a new pump (Don't weld the pushrod false economy and potentially could ruin the engine)



Cheers Trev.

T4 PEDAL BOX EXCHANGE SERVICE
07989 403806[email protected]
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Old 29-08-09, 18:45
Chucklebus Chucklebus is offline
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Default Re: Intermittent stiff brake pedal and poor braking

Thanks Trevor, it's a 1999 2.5Tdi.
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Old 01-09-09, 08:22
Chucklebus Chucklebus is offline
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Default Re: Intermittent stiff brake pedal and poor braking

I've found the fault. There's a t-piece in the hose from the vacuum pump to the servo with a tiny pipe coming away from it that's connected with braided rubber hose. It goes off into the bulkhead with the heater pipes. That little pipe had come away from the t-piece. I put it back on and now the brakes are perfect.
I can only assume that air was escaping here and causing loss of pressure in the servo, or at least meaning it took longer to build up pressure between each press of the pedal.
Seems like a very weak link in the system with potentially fatal consequences!
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Old 04-09-09, 13:59
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mcjjordan mcjjordan is offline
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Default Re: Intermittent stiff brake pedal and poor braking

maybe thats whats wrong with mine......


il have a look been like it for years now though
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Old 30-05-13, 15:16
stuworsley stuworsley is offline
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Default Re: Intermittent stiff brake pedal and poor braking


cracking bit of advice.....my brakes have been poor since i got the van , i had new discs and pads fitted and it always passes mot but never felt right to me.

i just assumed as this is my first van that this is how van brakes are.

just had a new clutch fitted and they seemed worse....so after reading this thread i found the excact same problem with the small bore pipe off.

refitted , test drive and nearly flew through windscreen......

top forum this
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Old 30-10-16, 07:36
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L4NF1R3 L4NF1R3 is offline
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Question Re: Intermittent stiff brake pedal and poor braking

Hi guys, does anyone have any pictures regarding the small t piece, coz I've got the same problem but can't see it!. I too have just had a new clutch fitted and it seems to be worse.
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Old 30-10-16, 11:10
JonCa JonCa is offline
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Default Re: Intermittent stiff brake pedal and poor braking

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Originally Posted by L4NF1R3 View Post
Hi guys, does anyone have any pictures regarding the small t piece,...........
Small T piece Is this what you mean ?

Find the vacuum hose at the servo and trace it back, there should be a few take-off points which will/may lead to T pieces,

At this link is a useful vacuum hose diagram which ought to give you an idea. https://www.vwt4forum.co.uk/showpost....55&postcount=4
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Old 30-10-16, 19:05
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L4NF1R3 L4NF1R3 is offline
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Default Re: Intermittent stiff brake pedal and poor braking

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Originally Posted by JonCa View Post
Small T piece Is this what you mean ?

Find the vacuum hose at the servo and trace it back, there should be a few take-off points which will/may lead to T pieces,

At this link is a useful vacuum hose diagram which ought to give you an idea. https://www.vwt4forum.co.uk/showpost....55&postcount=4
Cheers bud, will give it a look in the morning
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  #10  
Old 31-10-16, 15:56
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L4NF1R3 L4NF1R3 is offline
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Thumbs up Re: Intermittent stiff brake pedal and poor braking

Managed to have a look at my brake issues and managed to sort it out, the breather pipe was missing so replaced and boom working brakes
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