Question about 1990 Nissan Sentra

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Brake problem I have problem with my Nissan, when started the problem little by little the pedal got softer until the car didn't stop. After that I changed the Master Cilinder then test the car and after about 3 miles the pedal got extremly hard and the Calipers stuck also the rotors got really red. I appreciate your help thanks.

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  • patojo Feb 20, 2009

    I use DOT#3



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Well if its like that it seems like the vent valve inside the master cylinder isn't letting it breathe
but then again your master cylinder is if i were you i would check the rubber brake hose and all rubber components to see if they are soft or swooning because if the lines collapse then the brake calipers wont let the fluid that went inside the calipers come back out..

Posted on Mar 28, 2009

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Did you use DOT # 3 Brake fluid to fill up the master cylinder like your suppose to or did you use DOT #5 that your not suppose to use???find that bottle let me know asap.John

Posted on Feb 15, 2009


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Replaced both clipers on rear and rotors,bleed the lines,good brake padel, they are hard don't want to stop the car right away, can anyone make help me on this issue i am having.

The most obvious cause for a hard pedal is simply not enough vacuum. Check the hose running to your booster.could be a bad check valve in booster. To check remove valve from booster hose, Blow through the valve, if you can blow through it, it is bad. if you cant its ok! With car off. Pump the brakes until all air is out of booster. Hold brake down, then start car. if the pedal sinks a little. the booster is ok. If above fails, replace booster. If need be, you can check the rear brakes and see if one is sticking first! Make sure the caliper pins are well greased and slide good. God-Bless! a sticking caliper will cause a hard pedal.

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I am going to change the brake fluid in my 2000 GMC Sonoma 4 x 4.How many ounces, quarts, of brake fluid will I need?

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I drive a kia sportage 2007. When I press brake pedal twice or three especially when driving slowly, the pedal becomes stiff and the brakes seems to lock and car literally stops. However when i pump the...

Your problem is half normal actually. Pumping the brakes will build more pressure in the system and will make the pedal harder and the brakes will brake alot more, the brakes are designes this way. But if the brakes don't release after you let go of the pedal, that's not normal. If this is the case, there may be a few things that can be faulty, but i'd start by checking/replacing brake vacuum booster unit. If the unit is ok, then probably one of the calipers on the brakes are starting to jam due to rust and dirt, especially if you see the the rubber seals on the caliper pistons are damaged or missing.

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4. Turn the switch until it locks into place in the brake pedal bracket.
When turning the switch to lock into place, the switch backs off the stopper to the correct clearance automatically.
5. Release the brake pedal pad.


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