Brakes problem on 2007 silverado

[Jdroach1964]

I have a 2007 Silverado which I replaced the front dice brakes and rotors a few months back . The other day while I got in my truck headed out it seem like my brakes were not working right the paddle seem to go down further then normal and it wasn't stopping good I had them checked no air in lines and fluid level is fine I used low gear and pumped to help stop could it be the master cylinder is there a way to check . I'm low on funds so I don't have the money to bring to a shop. Someone please help I'm desperate thanks jill

 

[Bartman39]

jill... If the peddle is going down to far and you have no leaks in the brake system then about the only thing it could be is the master cylinder...? I would go over the system very closely and check everywhere on it for a leak first and if none can be found then price a new master cylinder to replace your old one...

 

[C1]

Yup, has all the earmarks of an internal leaking master cylinder. (Personally experienced it many times in the past.)

I used to buy a rebuild kit. (Comes with replacement main plunger.) I suppose now days you could just buy a whole rebuilt cylinder. In general, it's a bit of a hassel to do it yourself. Usually the biggest pain is to undo the connection pin at the brake pedal. You can actually bleed the system at connection lines to the new cylinder after filling the new master cylinder with fluid & working it so all air is purged.

Ya a bit of a hassel, but quite doable.

I sure remember those days/times - and they were many.

Best bet is to have a place like PEP BOYS do it for you.

 

[HarryLui]

Master Cylinder is around $100, I can't imagine it would take more than 2 hours labor.

You have a potential death trap, get it fixed ASAP.

 

[Raizinman]

I had them checked no air in lines

I don't know what this means? How did you have your brakes checked and determine there was no air in the lines?

It is possible to bleed your brakes incorrectly and thus cause damage to your master cylinder.

 

[Bartman39]

How did you have your brakes checked and determine there was no air in the lines?

By bleeding them a simple process...

Yes you can damage your master cylinder with an incorrect bleeding procedure which is to pump bleed till the reservoir is dry which can cause the master cylinder to fail (at times)...

 

[Raizinman]

By bleeding them a simple process...

Yes you can damage your master cylinder with an incorrect bleeding procedure which is to pump bleed till the reservoir is dry which can cause the master cylinder to fail (at times)...

Not always a simple process. If bleeding by using the two person method - one in the drivers seat and one at the bleeder, it is VERY common to ruin the seal on the master cylinder piston by pushing the brake pedal beyond the normal limit of the master cylinder. The cylinder will have a 'normal use' wear pattern, and when you push the pedal over this rough edge a few times, it will normally ruin the seal.

I would also want to know:

1) What wheel the OP started his bleeding (air check) process?
2) If pumping of the brake pedal would tend to give a stiffer pedal
3) What method of checking for air in the system did he use?

There are numerous inherent problems with the brake lines and ABS on this vehicle (See NTHSA) mainly due to salt and road grime.

 

[Jdroach1964]

Thanks everyone I finally took it to pep boy to find out what is wrong with it turns out rear brakes are shot and the rear cylinders are lecking. Now I just have to figur out how I'm gonna get the money to get it fix. I wish it was the master now. This is worst
Thanks jill