I have a 2006 311CDI LWB sprinter camper van. Had it parked up for six weeks Nov/Dec 2010 when I went to move it i found a brake problem.
symptoms:
Tngine off brake pedal is as you would expect solid and quite firm.
Engine on Brake pedal slowly goes all the way to the floor when pressure applied.
The system is not loosing fluid and Master cylinder Res level is not dropping.
If I brake quickly it will still stop as normal so the "leak" is very small.
Actions taken;
I have checked and there is definitely no leaks from any caliper, brake pipe or anywhere else.
I have bled all brake lines just in case but no change in the fault.
My thoughts
Its either the Master cylinder or the ABS pump. as these are the only two components that can cause this fault. i.e let fluid back into Res and not out onto the grass.
The van has the uprated brake master cylinder i.e. the 25mm bore version TRW25. . Have stripped and checked master cylinder all looks good.
I have ordered a replacement master cylinder (so no seal kit is available for the 25mm bore unit) Which I will fit as soon as it arrives.
so in the mean time any ideas before i spend £600 + vat on a new ABS pump.??
Sorry for the long thread am trying to avoid the easy answers to stuff i already tried
symptoms:
Tngine off brake pedal is as you would expect solid and quite firm.
Engine on Brake pedal slowly goes all the way to the floor when pressure applied.
The system is not loosing fluid and Master cylinder Res level is not dropping.
If I brake quickly it will still stop as normal so the "leak" is very small.
Actions taken;
I have checked and there is definitely no leaks from any caliper, brake pipe or anywhere else.
I have bled all brake lines just in case but no change in the fault.
My thoughts
Its either the Master cylinder or the ABS pump. as these are the only two components that can cause this fault. i.e let fluid back into Res and not out onto the grass.
The van has the uprated brake master cylinder i.e. the 25mm bore version TRW25. . Have stripped and checked master cylinder all looks good.
I have ordered a replacement master cylinder (so no seal kit is available for the 25mm bore unit) Which I will fit as soon as it arrives.
so in the mean time any ideas before i spend £600 + vat on a new ABS pump.??
Sorry for the long thread am trying to avoid the easy answers to stuff i already tried