What would cause the rear brakes to make a pulsating noise?

Tiny
LISALYNNP
  • MEMBER
  • 2017 TOYOTA COROLLA
  • 1.8L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 55,500 MILES
What would cause the rear brakes to make a pulsating noise when slowing down hill from freeway speeds without shudder in the pedal? My mechanic says it needs front brake but I want to save money and do it myself can you help me?
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Sunday, September 22nd, 2019 AT 2:25 PM

1 Reply

Tiny
JOE F
  • EXPERT
Hi,

Replacing front brake pads and rotors really isn't that difficult. When you do it yourself, make sure to get lifetime replacement parts so you never have to pay again.

You can expect front brakes to last approximately 25,000, but that will vary based on terrain and driving habits. First, here is a link that shows in general how it's done. You can use this as a guide which is on a similar car the process is the same.

https://youtu.be/VtqeB0qgrTs

and

https://www.2carpros.com/articles/how-to-replace-front-brake-pads-and-rotors-fwd

Here are the directions specific to your vehicle. The attached pics correlate with the directions.

REMOVE FRONT DISC BRAKE CYLINDER ASSEMBLY
Hold the 2 front disc brake cylinder slide pins and remove the 2 bolts and front disc brake cylinder assembly.

REMOVE FRONT DISC BRAKE PAD
Remove the 2 front disc brake pads from the front disc brake cylinder mounting.

REMOVE FRONT ANTI-SQUEAL SHIM
Remove the front No. 1 anti-squeal shim and front No. 2 anti-squeal shim from each front disc brake pad.
Remove the pad wear indicator plate from each front disc brake pad.
REMOVE FRONT DISC BRAKE PAD SUPPORT PLATE
Remove the 4 front disc brake pad support plates from the front disc brake cylinder mounting.

NOTICE:

Each front disc brake pad support plate has a different shape. Be sure to put an identification mark on each front disc brake pad support plate so that it can be reinstalled to its original position.

REMOVE FRONT DISC BRAKE CYLINDER SLIDE PIN
Remove the front No. 1 disc brake cylinder slide pin and front No. 2 disc brake cylinder slide pin from the front disc brake cylinder mounting.

*1 Front No. 1 Disc Brake Cylinder Slide Pin
*2 Front No. 2 Disc Brake Cylinder Slide Pin

REMOVE FRONT DISC BRAKE CYLINDER SLIDE BUSHING
Using a screwdriver with its tip wrapped with protective tape, remove the front disc brake cylinder slide bushing from the front No. 2 disc brake cylinder slide pin.
NOTICE:

Do not damage the front No. 2 disc brake cylinder slide pin.

REMOVE FRONT DISC BRAKE BUSHING DUST BOOT
Remove the 2 front disc brake bushing dust boots from the front disc brake cylinder mounting.

REMOVE FRONT DISC BRAKE CYLINDER MOUNTING
Remove the 2 bolts and front disc brake cylinder mounting from the steering knuckle.

REMOVE FRONT DISC
Put matchmarks on the front disc and the front axle hub sub-assembly.

Remove the front disc.

Install

CAUTION / NOTICE / HINT

Use the same procedure for the LH side and RH side.
The following procedure is for the LH side.
PROCEDURE
INSTALL FRONT DISC
Align the matchmarks of the front disc and front axle hub sub-assembly, and install the front disc.
NOTICE:

When replacing the front disc with a new one, select the installation position where the front disc has minimal runout.

INSTALL FRONT DISC BRAKE CYLINDER MOUNTING
Install the front disc brake cylinder mounting to the steering knuckle with the 2 bolts.
Torque : 106.8 Nm (1089 kgf-cm, 79 ft-lbf)

INSTALL FRONT DISC BRAKE BUSHING DUST BOOT
Apply a light layer of lithium soap base glycol grease to the entire circumference of 2 new front disc brake bushing dust boots.

HINT:

Apply more than 0.3 g (0.01 oz.) of lithium soap base glycol grease to each front disc brake bushing dust boot.

Install the 2 front disc brake bushing dust boots to the front disc brake cylinder mounting.
INSTALL FRONT DISC BRAKE CYLINDER SLIDE BUSHING
Apply a light layer of lithium soap base glycol grease to the contact surface of the front No. 2 disc brake cylinder slide pin.
Install a new front disc brake cylinder slide bushing to the front No. 2 disc brake cylinder slide pin.

INSTALL FRONT DISC BRAKE CYLINDER SLIDE PIN
Apply a light layer of lithium soap base glycol grease to the sliding part and the sealing surfaces of the front No. 1 disc brake cylinder slide pin and front No. 2 disc brake cylinder slide pin.

Install the front No. 1 disc brake cylinder slide pin and front No. 2 disc brake cylinder slide pin to the front disc brake cylinder mounting.
Push the front No. 1 disc brake cylinder slide pin and front No. 2 disc brake cylinder slide pin into the front disc brake bushing dust boot to engage the pins to the boots.
INSTALL FRONT DISC BRAKE PAD SUPPORT PLATE
Install the 4 front disc brake pad support plates to the front disc brake cylinder mounting.
NOTICE:

Be sure to install each front disc brake pad support plate in the correct position and direction.

INSTALL FRONT ANTI-SQUEAL SHIM
NOTICE:

When replacing worn pads, the front anti-squeal shims and pad wear indicator plates must be replaced together with the pads.

Apply disc brake grease to both sides of each front No. 1 anti-squeal shim as shown in the illustration.

NOTICE:

Apply disc brake grease to the area that contacts the anti-squeal shims.

Install the front No. 1 anti-squeal shim and front No. 2 anti-squeal shim to each front disc brake pad.

*1 Front No. 1 Anti-squeal Shim
*2 Front No. 2 Anti-squeal Shim
*3 Pad Wear Indicator Plate

NOTICE:

Install the shims in the correct position and direction.
Disc brake grease may seep out slightly from the area where the anti-squeal shims are installed.
Make sure that disc brake grease is not applied onto the lining surface.
Install the pad wear indicator plate to each front disc brake pad.
NOTICE:

Install each pad wear indicator plate in the correct position and direction.

INSTALL FRONT DISC BRAKE PAD
Install the 2 front disc brake pads to the front disc brake cylinder mounting.
NOTICE:

There should be no oil or grease on the friction surfaces of the front disc brake pads or the front disc.

INSTALL FRONT DISC BRAKE CYLINDER ASSEMBLY
Hold the 2 front disc brake cylinder slide pins and install the front disc brake cylinder assembly to the front disc brake cylinder mounting with the 2 bolts.
Torque : 34.3 Nm (350 kgf-cm, 25 ft-lbf)

CONNECT FRONT FLEXIBLE HOSE
Click here [ BRAKE (FRONT): FRONT BRAKE FLEXIBLE HOSE: INSTALLATION+ ]

BLEED BRAKE LINE
Click here [ BRAKE SYSTEM (OTHER): BRAKE FLUID: REPLACEMENT ] [ BRAKE SYSTEM (OTHER): BRAKE FLUID: REPLACEMENT ]

INSTALL FRONT WHEEL
Torque : 102.9 Nm (1049 kgf-cm, 76 ft-lbf)

Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.
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Tuesday, March 2nd, 2021 AT 3:23 PM

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