brake pedal goes all the way down when braking

20

Asked by Jan 24, 2008 at 01:26 AM about the 1990 Honda Civic CRX CRX

Question type: Maintenance & Repair

I just replaced all break shoes/pads in my CRX, as well as faulty Wheel break Cylinder.  now the car brakes but the pedal gradually goes all the way down. not sure how to test if I need a new Master brake cylinder or a new power booster?  Also, my parking brakes are all wacked,  when pulled, they do not stop the car.  I may have to check the cables this weekend.

BTW, I checked the vac hose to the booster and no leaks detected, as well as the one way valve .thanks.

7 Answers

YOU HAVE 1 OF 2 PROBLEMS,OK 1 SOLVED BAD WHEEL CYLINDER, DID YOU BLEED ALL THE AIR OUT OF LINE,SOMETIMES WHEN YOU REPLACE ONE IT IS GOOD TO REPLACE THE OTHER SIDE AS WELL,YOU MAY HAVE TO BLEAD ALL 4 WHEELS OR YOUR MASTER CYLENDER IS BAD LOOK WHERE IT BOLTS TO BOSTER SEE IF WET AROUND M.C.IF SO REPLACEMASTER CYLEMDER DONT FORGET TO BENCH BLEED BEFOR INSTALLING.

3 out of 3 people think this is helpful.
40,245

Agreed, I would bleed the rear wheels (both sides now that you have driven it a bit) starting with the passenger side rear wheel. Then determine if MC is bad after making sure rear wheels are fully bled.

1 out of 1 people think this is helpful.
20

Thank you for your advice, but I did bleed all wheels. MC looks dry around the its base. I even checked the vacuum hose that goes to the power booster for air leaks or faulty valve, but it all looks fine. now my next step is to replace MC or power booster, I just don't know which one may be out. thanks for your help,

2 out of 2 people think this is helpful.
85

The booster won't make your pedal go to the floor. If you bled all the brakes, and there is no leaks, then its most likely the master cylinder. You can take them apart and clean it, but if the seals are to bad then you should just replace then bleed the brakes again.

3 out of 3 people think this is helpful.
7,515

'now the car brakes but the pedal gradually goes all the way down' This generally means the master cylinder is bad or that you have a slow leak... Air in the system generally won't act this way... well since the air is too compressible... It's not a gradual feeling... If it were air you'd push the peddle all the way down and it would barely brake if at all... the gradualness of the drop means you are loosing pressure and to maintain the pressure that you have, you have to force more fluid into the system... Usually this is traced back to a bad master cylinder but it's possible that you have a slight high pressure leak elsewhere. Double the work you've done... Put the car on stands have someone pressure up the brakes and see if it's leaking slowly from anywhere you just worked on... Since it happened after the repairs, then this is a good place to start... If it's not that then it's likely the master cylinder...

2 out of 2 people think this is helpful.
45

Did you replace all pads, or shoes if fitted,if so,when you returned the brake caliper piston,if you did it very quickly,pushing the piston in that is,then you stand a very good chance of reversing the rubber seals in the master cylinder,this will also give you a very bad brake.to correct it ,in most cases,removal,strip and rebuild,possible new seals,check the bore has not gone ovel or damaged in any way.

2 out of 2 people think this is helpful.

97 civic just replaced both rear wheel cylinders and shoes, adjusted parking brake. Replaced booster and MC (and bench bled) blended all the air out of the lines no bubbles no leaks. And brake pedal still goes to floor any suggestions?

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