hey guys i have a 94 316i lux tourer breakes are worrying pedal builds pressure but then continues to the floor before breakes are applied
ive not tried to bleed brakes yet as i presumed it would be the master cylinder as iv not done one before is there anyone who can give a rough guide to doing this or advice on the innitial problem thanks
dan
the brakes have now been bled and it worked for bout 10 mins then pedal sank again help please anyone!
brake master cylinder
Moderator: martauto
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peterjcollins
- E30 Zone Newbie
- Posts: 104
- Joined: Sun Oct 14, 2007 11:00 pm
Hi,
It definetly sounds as though the seals have worn out in the master cylinder especially as the foot pedal drops to the floor. The pressure you are experiencing is the vacuum releasing.
Has any work recently been carried out on the braking system, like brake pad or brake shoe change? If so has the caliper pistons been pushed back reversing the seals in the master cylinder.
Have you checked for any leaks on the system?
If your car has rear brake shoes is there any signs of fluid leaking at the back plate on the inside of the rear wheels? If so the wheel cylinders are leaking.
Is there any signs of fluid leaking from flexible brake hoses or hydraulic pipes? If so replace as necessary.
If none of the above, replace the master cylinder and bleed system through with new dot 4 brake fluid. Start bleeding with the right handside rear then left rear, then right front and finally the left front. You may have to do this 2-3 times if using the jam jar and tube method
Good luck
Peter
It definetly sounds as though the seals have worn out in the master cylinder especially as the foot pedal drops to the floor. The pressure you are experiencing is the vacuum releasing.
Has any work recently been carried out on the braking system, like brake pad or brake shoe change? If so has the caliper pistons been pushed back reversing the seals in the master cylinder.
Have you checked for any leaks on the system?
If your car has rear brake shoes is there any signs of fluid leaking at the back plate on the inside of the rear wheels? If so the wheel cylinders are leaking.
Is there any signs of fluid leaking from flexible brake hoses or hydraulic pipes? If so replace as necessary.
If none of the above, replace the master cylinder and bleed system through with new dot 4 brake fluid. Start bleeding with the right handside rear then left rear, then right front and finally the left front. You may have to do this 2-3 times if using the jam jar and tube method
Good luck
Peter
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octanejunkie
- E30 Zone Regular
- Posts: 479
- Joined: Fri Jul 02, 2010 11:00 pm
- Location: Somerset England
master cylinder for sure.
Its a bolt on part. Simply ubolt the old one, carefully remove, and bolt on the new one.
Remove as much fluid as you can before you start as brake fluid is nasty to paintwork. Its a messy job, but not beyond the realms of DIY. Obviously the brakes will need bleeding properly once the new master cylinder is fitted.
Its a bolt on part. Simply ubolt the old one, carefully remove, and bolt on the new one.
Remove as much fluid as you can before you start as brake fluid is nasty to paintwork. Its a messy job, but not beyond the realms of DIY. Obviously the brakes will need bleeding properly once the new master cylinder is fitted.
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leeparkes
- Married to the E30 Zone
- Posts: 9538
- Joined: Thu Jan 03, 2008 11:00 pm
- Location: Black country
Before you start this job make sure you can get all the bleed screws undone.
Cypriotgeeza wrote:I done both my mates in my old 318is
felt so proud,even tried it with a E30 325i and got put in my place..
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bomber1618
- E30 Zone Newbie
- Posts: 13
- Joined: Sun Aug 15, 2010 11:00 pm
- Location: nottingham
cheers guys ill report back when ive attempted all the above thanks for your help 
just out interest would my engine be the m40? sorry for the newb question just so i know for future reference cheers again dan
just out interest would my engine be the m40? sorry for the newb question just so i know for future reference cheers again dan
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daimlerman
- **BANNED**
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- Location: Grumpy Old Man
Yes,you will have an M40 engine.
I use an oil syringe to suck fluid out of the brake master fluid holder thingy,then you need an 11mm spanner for the brake pipe connections(two on ABS cars and three on non-ABS cars)and finally a 13mm for the master's nuts to the servo.Mind the starter motor connections when tackling the servo fitting!
I use an oil syringe to suck fluid out of the brake master fluid holder thingy,then you need an 11mm spanner for the brake pipe connections(two on ABS cars and three on non-ABS cars)and finally a 13mm for the master's nuts to the servo.Mind the starter motor connections when tackling the servo fitting!
Youth is wasted on the young.