Hey guys, sorry to join the party so late.
Been real useful reading through so far but any further advice would go down a treat!!
I've got a [European] '93 E34 530 with the 3 litre V8 and it's running the hydraulic booster setup, as standard to my knowledge as it doesn't look played with.
I've had the car off the road for a year and now that I've come to get it back on the road the brake pedal isn't firming up like it should.
At this point I expect you'll be saying 'bleed the brakes man!!'
I've done that over and over, in everyway I can think of, even bypassed the ABS box with new sections of pipe to make sure no air was hiding(copper lines, not sure about them bursting yet).
Here's what happens:
Engine off = pedal pumps up nice and hard and you can stand on it as hard as you like with no fade at all. Perfect.
Engine running = pedal very spongy and will go to floor. On test drive, brakes do work with pedal on floor but nowhere near enough to even skid on a wet road.
If the master cylinder was at fault, I'd think the pedal would fade even with engine off no??
Also there's a hissing noise from the booster's pressure regulator when pressing on pedal, could it be letting too much pressure into the booster and in turn overwhelming the master cylinder seals?
If anyone could tell me which other models use the hydraulic system and would be a straight swap that'd be really handy. Seems a bit rare but swapping to the vacuum setup seems like pointless hassle.
Trouble is I cant find any parts shops that list my master cylinder and I dont know which other models fit, so whether I go for new or used parts, I'm stuck at the moment :(
Any help much appreciated,
Phill
Been real useful reading through so far but any further advice would go down a treat!!
I've got a [European] '93 E34 530 with the 3 litre V8 and it's running the hydraulic booster setup, as standard to my knowledge as it doesn't look played with.
I've had the car off the road for a year and now that I've come to get it back on the road the brake pedal isn't firming up like it should.
At this point I expect you'll be saying 'bleed the brakes man!!'
I've done that over and over, in everyway I can think of, even bypassed the ABS box with new sections of pipe to make sure no air was hiding(copper lines, not sure about them bursting yet).
Here's what happens:
Engine off = pedal pumps up nice and hard and you can stand on it as hard as you like with no fade at all. Perfect.
Engine running = pedal very spongy and will go to floor. On test drive, brakes do work with pedal on floor but nowhere near enough to even skid on a wet road.
If the master cylinder was at fault, I'd think the pedal would fade even with engine off no??
Also there's a hissing noise from the booster's pressure regulator when pressing on pedal, could it be letting too much pressure into the booster and in turn overwhelming the master cylinder seals?
If anyone could tell me which other models use the hydraulic system and would be a straight swap that'd be really handy. Seems a bit rare but swapping to the vacuum setup seems like pointless hassle.
Trouble is I cant find any parts shops that list my master cylinder and I dont know which other models fit, so whether I go for new or used parts, I'm stuck at the moment :(
Any help much appreciated,
Phill
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