Question about 2004 Chevrolet TrailBlazer

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Loss of brake pressure

Mazda 2000 protege. Brakes checked recently (80/40 for wear).
Pedal will now go all the way down to the floor. If I pump them I get some pressure back but ussually diaspates pretty quickly. Is the master cylander toast or is it a seal that can be fixed?
thanks
-worried in seattle

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  • Anonymous Nov 29, 2008

    When i push my brake peddle it goes almost to the floor before i stop.

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  • 62 Answers

Do you have a loss of fluid?

Posted on Nov 24, 2008

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1 Answer

`How do I determine if the brake master cylinder is failing ? No fluid leaks brakes do not pump up when bleeding system,recently brake pedal stayed down to floor, pulled back up with my foot.


If there are no external brake fluid leaks, continued application of pressure on the brake pedal will see the pedal sink to the floor if the MC is faulty and needs to be replaced. This will be due to significant wear inside the MC in the bore and on the pistons.

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It is very difficult to diagnose this problem with the little bit of information you gave. If the brakes are drum brakes check to see if the brake cylinder is working and has no leaks, lift the rubber seals and make sure there are no leaks there, check the brake adjuster make sure that works okay. If everything works and you bled the brakes properly, then the problem is most likely is the master cylinder or the wheel cylinder.



While bleeding the brakes always make sure you check the master cylinder reservoir to make sure the fluid level is up so you do not get air in the brake lines. When bleeding the brakes did you have someone press down hard on the brake pedal hold the pressure on the brake pedal when opening the bleeder then push the brake pedal to the floor keep it there, until you tightened the bleeder, then pump the brakes up and hold it there, while you repeated the bleeding operation by opening the bleeder when the brake pedal go\'s to the floor keep the pedal down until you tighten the bleeder and then pump the brake pedal back up then check the fluid level in the reservoir, keep doing it until the brake fluid shows no sign of air.



If the brake pedal is pumping up during the bleeding process and you made sure you got all the air out of the brakes and then the pedal go\'s to the floor, make sure the fluid level is correct in the reservoir and the bleeder is closed tight and there are no leaks in the lines, wheel cylinder, brake cylinder the brake adjuster is working and master cylinder, and if you still have no brakes then it must be a defective piston in the wheel or brake cylinder, if there is a seal problem with the pistons you will not get any pressure to push the brake fluid. let me know how you are doing.

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Are rear brakes in 2000 mazda protege self adjusting?


If the rears are not adjusted right, it could be a problem. And they should be self-adjusting, although often the adjusters get frozen from rust, corrosion, dirt. To adjust them, you drive in reverse and hit the brakes. Every time you do this the adjuster should click-it has made one turn on the adjuster's star wheel. Do it a few times: reverse, press brakes; reverse, press brakes. If brakes were too loose, and adjusters were working, the brake pedal may brake better now-pedal may be higher when brakes are pressed. If not sure, peel off the rubber plug on back bottom of brake backing plate. You should see the adjuster star wheel. Use a screwdriver and see if you can turn the star wheel either way. If still not sure, take the brake drum off, pull the shoes off, and take off the adjuster for cleaning. They are very simple devices, only a few parts to them. If they need cleaning to free up, do so. Then use some high temperature grease, very sparingly, on the adjuster's threads. Put them back on, shoes, and drums, then do the reverse and brake again to get them adjusted. Should work great now. When you pull the drum off, you can check if you need new brake shoes- not likely, but check.
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1 Answer

Cant get any brake pressure


Did you bleed the brakes? Probably sucking air in system either a popped line or a bad master cylinder. Would check master cylinder cap seal first. then secondly bleed brakes. Have a buddy there to help step on pedal. Check for any recent drips on the driveway to help narrow down. pump the brakes. If pedal is gong to floor you either got a leak or air! Hope this helps.

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1 Answer

Brakes have a mushy to floor response


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This could be loss of pressure in master cylinder due to rubber cup wear. Does pumping the brake pedal give you more pressure and higher pedal even if for a little while? Vacuum leak on power boost sometimes makes a gushing air sound and longer stopping distance.

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if the brake fluid resovoir is full and you havent opened the brake brake system (ie a bleeder screw or removed a brake line) then you probably need a master cylinder. if the brake fluid IS empty then first you must find the leak and repair it before bleeding will do any good.

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Something doesn't sound right, you shouldn't have to remove the brake line to install pads. Did you have to do this on both sides? Do the new pads and the old pads look the same? Did you get the caliper on crooked? Just recheck your work first before replacing more parts. When you install the caliper, You have to hook the pad on one side first before you slide it over the rotor.

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