brake problem

[79elcamino]

i had new pads and shoes put it and new black powder coated drums(rear) put in, everything was good, then i put in black powder coated calipers (front),after each install i had the brakes bleed and after that i notice after i stop the car, which is requiring a little more pressure then usual, i can push the pedal down to right above the floor, when putting in the front calipers the master reservoir did get emptied so my first thought was air got in the master cylinder so i had it bleed and still wasnt right so maybe it got damaged so i replaced it, after each installation i have the brakes bleed and the master cylinder was bench bleed and bleed on the car and so were the lines, my mechanic is like the brakes are good, the car does stop and the pedal doesnt travel to the floor on its own, but once the car is stopped i can use a little pressure and the pedal then goes right above the floor, before i put the new calipers in the pedal did not travel as much

[Mr Miyagi]

Re: brake problem

Did you bleed in the right order (furtherst from master cylinder first...)

What kind of car..does in have vacuum booster on the brakes?

[Rcktsled]

Re: brake problem

This is kind of a shot in the dark but; are the calipers installed with the bleed screws at the top? On some cars the calipers can be installed upside down and no matter how much you bleed the system there will always be some air trapped at the top.

[79elcamino]

Re: brake problem

yeah they were bleed in the right order, and what do u mean the calipers can be installed upside down? calipers cant be installed upside down, they only go one way and yes the bleeder screw is at the top

[Rcktsled]

Re: brake problem

On some cars, like a Mustang I had, the calipers will fit on either side. Like I said, it was a shot in the dark!

[79elcamino]

Re: brake problem

these calipers have a L and an R on them and its a 2006 nissan sentra and yeah it has a brake booster

[Tim Lingor]

Re: brake problem

Hey,


If they are drum brakes in the rear, did you tighten the adjuster to make sure the shoes are at the appropriate tightness to the drum? (Spin the wheel by hand and turn the adjuster until there is a little drag)

There are a couple of things that come to mind: If your master cylinder is bad, then you will lose pressure and the pedal will slowly depress to the floor. I do not think it is a vacuum problem because if it was the pedal would go hard as there would be no boost to assist it.

The other thing which is a shot in the dark, sometimes the the ABS module gives out. You will need to do a search on how to test that on the Sentra.

Good luck and keep us posted!

Tim

[79elcamino]

Re: brake problem

Hey,


If they are drum brakes in the rear, did you tighten the adjuster to make sure the shoes are at the appropriate tightness to the drum? (Spin the wheel by hand and turn the adjuster until there is a little drag)

There are a couple of things that come to mind: If your master cylinder is bad, then you will lose pressure and the pedal will slowly depress to the floor. I do not think it is a vacuum problem because if it was the pedal would go hard as there would be no boost to assist it.

The other thing which is a shot in the dark, sometimes the the ABS module gives out. You will need to do a search on how to test that on the Sentra.

Good luck and keep us posted!

Tim

no abs in this car, i changed the master cylinder thinking that was the problem and when i had the new shoes put on they were adjusted, it was only after i put in the new calipers is when i started having the problem, i put the new calipers on about 1-2 weeks after i did the drums, they were not done at the same time

[79elcamino]

Re: brake problem

and i know that there r no leaks, cause i have drove over 200 miles and i havent had to had any brake fluid

[79elcamino]

Re: brake problem

i was reading somewhere that when you replace the drum and shoes, you might need to adjust them a couple of times until they fully seat with the drums.