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ChrisWk 09-12-2013 09:59 PM

Rear brake problems
I just installed new centric blank rotors and Wagner Thermo brake pads. Have put about 800 miles on them they should be broke in, but I got a vibrating pulstaing feeling in the brake pedal . What should I look for the jeep fine.



brentwoodkris 09-13-2013 02:55 PM

Re: Rear brake problems
You specify a "rear" brake problem, but did you replace the front rotors/brakes too? My OEM front rotors were crap steel and warped practically by touching them. Those are a lot more important to replace if you're getting pulsing in the brakes. Especially when you consider that the majority of your braking power comes from up front. Also, if you haven't ever had it done, I'd have your brake fluid flushed out and replaced to eliminate the possibility of bubbles or air contamination/degradation.

ChrisWk 09-13-2013 03:47 PM

Re: Rear brake problems
Sorry should have added more info, I did the rear first the pulsating and vibrating did not go away so I did the front rotors and pads the front and bleed the brakes put in new fluid, the old fluid had about 40k on it so did the front pads and rotors. Should I get the new rotors turned ? I hate to take it to brake shop it defends saving all this money DIY.

brentwoodkris 09-13-2013 03:58 PM

Re: Rear brake problems
If you bought new rotors, you shouldn't have to get them turned as they're as flat as they'll ever be since they just came from the factory. Did you also put centric rotors on the fronts?

Essentially, if you have new rotors and pads on all four brakes and have also bled the lines properly, the pulsing isn't being caused by one of those parts. You might want to check your caliper pistons for free motion (not frozen). Also make sure that your caliper slide pins are lubricated to allow the pads to slide back off the rotor quickly. Finally, depending on the "pulsing" you're feeling, it could be due to an ABS sensor malfunction.

ChrisWk 09-13-2013 04:14 PM

Re: Rear brake problems
How do you check ABS sensors , I got the same brand on the front rotors centric and Wagner Thermo pads . I lubed the pins, there is a old thread of my old front rotors with hot spots and pad burn in.

robpp 09-14-2013 10:48 PM

Re: Rear brake problems
What about the emergency brake pads. They fit into rear of the rotor

ChrisWk 09-15-2013 10:41 AM

Re: Rear brake problems

Originally Posted by robpp (Post 893547)
What about the emergency brake pads. They fit into rear of the rotor

That was the next thing I was going to look at, When I use the ebrake handle I have to pull it up high to get it to hold on a hill. So could the e brake pads cause some of my problems.

Scottina06 09-15-2013 12:53 PM

Re: Rear brake problems
could just need a bed in???

brentwoodkris 09-16-2013 11:13 AM

Re: Rear brake problems
The e-brakes shouldn't cause pulsing in the pedal...the pads on mine had actually released from the shoes (on both sides) and aside from an occasional thunk noise, I didn't know it wasn't working except that I had to pull the handle up high. I hate adjusting shoes, so I installed them and took it to my nearest shop, where they adjusted them and made sure the cable was properly tensioned for like $25 or $30.

brentwoodkris 09-16-2013 11:14 AM

Re: Rear brake problems

Originally Posted by Scottina06 (Post 893754)
could just need a bed in???

Also, I've bedded a lot of pads/rotors, and I've never had pulsing during the bed in. It's always been as smooth as butter, and I just took it easy for the first 500 miles before I slammed on the brakes.

That's not to say that it's impossible, just that I've never experienced pulsing during bed in.

Scottina06 09-16-2013 11:58 AM

Re: Rear brake problems
no I meant did he do a "bed in" just after install? I always do a bed in after install to get that glazing that prevents what the OP is suggesting his brakes are doing.

read here

Chris....I hate to say it...but you may need to de-glaze your rotors. It seems you have some uneven glazing causing your symptoms.

stashgto 09-16-2013 12:21 PM

Re: Rear brake problems
I have one question I'm trying to determine whether it's coming from the front , or rear. when the pulsating does come do you get any movement in the steering wheel? Try going about 55-60 then stop with pretty good pressure if it's the front you will most likely feel it in the steering.With out knowing this if it were me I'd look at warranty exchange the whole set up. If the rotors were old, but resurfaced have them check for excessive run out, or glazing

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