Car shakes when braking after new pads and rotors

SHEEHYJC

MEMBER
2010 NISSAN MURANO
3.5L
6 CYL
4WD
AUTOMATIC
120,000 MILES

I changed my front rotors and pads on my vehicle a few days ago. Drove the car for a bit and now the car does a little stutter or shake when I brake to come to a stop. It shakes or stutters shortly before it comes to a stop. You can feel it in the pedal that the pads seem to be shaking or stuttering when braking. It feels like it's coming from the front brakes. I took it all apart and redid them. This time I added the red disc brake quiet to the back of the pads hoping this would help. After all of this it still does it. All caliper pins are new and greased, pads greased when it touches caliper bracket, all bolts torqued to correct lbs, calipers slide easily, pistons aren't stuck.
When changing the pads I got a small amount of caliper grease on the pads and thought I was spraying brake cleaner on the pads but accidentally sprayed the bolt loosener "Blaster" on the pads. I immediately wiped off and sprayed brake cleaner on it a couple times and it appeared there was no "Blaster" on the pad. I only say this because could that be the cause? Thanks!

3 Replies

JACOBANDNICKOLAS

MECHANIC
109,885 POSTS

Welcome to 2CarPros.

If you feel in in the steering as well, you have a warped rotor. Are you certain nothing was hanging up which would have caused the rotor to overheat? If you safely lift the front of the vehicle, are you easily able to turn both wheels? If you have a helper apply and release the brake pedal, does the wheel start to turn again easily? Check this for me.

If you are feeling a pulsation in the brake pedal, unless something was put together wrong, it sounds like a warped rotor which should be under warranty. Everything you described above sounds like you did a good job. And the PB Blaster won't hurt if you sprayed it off with brake cleaner.

Let me know if you have other questions. Also, the easiest way to determine if a warped rotor is in the front or rear is by where you feel the pulsation. If it is more in the steering, suspect the front brakes. If you feel it in the seat or floor, suspect the rear.

Joe

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Monday, October 7th, 2019 AT 6:03 PM

SHEEHYJC

MEMBER
2 POSTS

I think I may feel the shaking more in the seat so maybe it's the back rotors causing this. I only changed the front brakes and rotors and the back ones look rough. I planned on changing the back ones in the next week. The car shook a lot when braking prior to changing the front rotors and brakes. The shaking feels different now than previously but maybe its because only my back rotors are bad now. I didn't think it was the back rotors causing the shaking because it felt different. But how you explained how front and back rotors cause you to feel shaking in different spots I think that's it. Thanks it was driving me crazy. I'll let you know when I change back rotors if everything feels better afterwards. Thanks again!

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Monday, October 7th, 2019 AT 6:39 PM

JACOBANDNICKOLAS

MECHANIC
109,885 POSTS

Welcome back:

Just FYI. The rear brake rotors are a bit more difficult to remove because behind the rotor's hat are the parking brake shoes. You will most likely need to adjust them down to remove the rotor.

Here are the directions for removal and replacement of the parking brake shoes. I'm adding them because the directions show how to make the needed adjustments both to remove them and then to readjust them after the new rotor is installed.

_________________________________________________-

PARKING BRAKE SHOE

Removal and Installation

REMOVAL

WARNING:
Clean any dust from the parking brake shoes and back plates with a vacuum dust collector. Never blow with compressed air.
1. Remove rear tires with power tool.
2. Remove disc rotor. See: Brake Caliper > Removal and Replacement > Removal And Installation.

CAUTION:
Parking brake completely in the released position.
3. If disc rotor cannot be removed, remove as follows:
a. Fix the disc rotor with wheel nuts and remove the adjusting hole plug.

Pic 1

b. Using suitable tool, rotate adjuster (1) in direction (B) to retract and loosen parking brake shoe.
4. Remove anti-rattle pins, retainers, anti-rattle spring, adjuster spring and return springs.

CAUTION:
Never drop the removed parts.
5. Remove parking brake shoes, adjuster assembly and toggle lever.

CAUTION:
- The parking brake shoes for the front side are made of different materials from those for the rear side. Never misidentify them when removing.
- Never drop the removed parts.

INSTALLATION
Install in the reverse order of removal.
- Apply PBC (Poly Butyl Cuprysil) grease or silicone-based grease to the back plate and brake shoe.

CAUTION:
The parking brake shoes for the front side are made of different materials from those for the rear side. Never misidentify them when removing and replacing.

Pic 2

pic 3

- Assemble adjusters so that threaded part is expanded when rotating it in the direction shown by arrow.
- Shorten adjuster by rotating it.
- When disassembling, apply PBC (Poly Butyl Cuprysil) grease or silicone-based grease to threads.
- Check parking brake shoe sliding surface and drum inner surface for grease. Wipe it off if it adhere on the surfaces.

______________________________________

I hope this helps. Take care and I will watch for the results.

Joe

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