SOURCE: bad brakes !help please im at wits end here
hi, the problem your having sounds like you need the brake servo replacing this is a common problem on all makes of car and the cause is the servo.
The servo is the part under the bonnet that has all the brake pipes going to it and it also goes to your brake pedal these are not that expensive to buy but can be difficult to fit as you have to undo all brake hoses and pipes then when you fit new one you need to make sure the pipes are fitted correct else they will leek and also once the new one is fitted you will need to bleed the whole system at all four wheels to ensure their is no air left in the brake line.
Once this is replaced you should find you have no problems and then your brakes will be as good as new.
The only other problem to cause air in the brakes is if the back brakes are not disk then you need to remove the hub and check the brake cylinder that pushes the shoes onto the hub when braking but if your car has disk brakes on the back as well as front then i would replace the servo.
Hope this is some help to you let me know how you get on or if you have any questions ok
SOURCE: rear driverside caliper replacement
read this information
http://www.zeckhausen.com/bleeding_brakes.htm
Robert
SOURCE: cant bleed back brakes
Temporarily slacken off the joint on the new line closest to the master cylinder - check you can get some fluid there.
If you do, re-tighten the joint.
Then move to the next join down towards the wheel and repeat the action there.
If you dont get fluid at any joints tested you may have:-
1) air in the master cylinder -that will need to be corrected before you go further,
2) a rear brake circuit lockout at the master cylinder that needs re-setting- check manual for any details of that safety function (if fitted).
SOURCE: rear brake cylender replacement
have you tried gravitiy bleeding yet? if not try that and see what happens , also use a silicone based brake fluid it will held with the old trash filled lines a bunch.
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