How do you decompress the cylinders to put new brake pads on?

Tiny
TOYPACIFIC
  • MEMBER
  • 2015 TOYOTA TACOMA
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 89,000 MILES
Hi guys, I was going to do a brake pad replacement and was curious as to how to decompress the cylinders to put the new pads on. Thanks in advance.
Wednesday, March 6th, 2024 AT 6:31 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Hi,

There are special tools that you can purchase to do this. However, it can also be done with one of the old brake pads and a large C clamp. First, place the inner worn brake pad over the caliper pistons. Then attach a C-clamp on the old pad and the rear of the caliper, making sure not to touch anything that can be damaged. When you tighten the clamp, the pistons will be pushed back in by the old pad.

When you do this, take your time and don't force it too fast. I usually open the brake master cylinder cap but place a shop towel around the opening to catch any fluid that comes out. Or you can open the caliper bleeder and allow fluid to exit at that point. Just make sure to re-tighten the bleeder right when you release pressure.

One other thing, before depressing the caliper pistons, spray any dirt off the rubber boots and make sure the slid pins are clean and lubricated.

Take a look through this link. It explains how to replace the brake pads. Included is depressing the caliper piston. Take a look and let me know if this helps. Note: The link indicates a front-wheel drive pad and rotor replacement. The logic is the same. However, if you don't plan to replace the brake rotors, there is no need to remove the caliper bracket.

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

Take care and let me know if this helps or if you have other questions.

Take care,

Joe

Note: I believe these vehicles all had rear drum brakes. Thus, the recommendations above are based on front pad replacement.
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Wednesday, March 6th, 2024 AT 7:41 PM
Tiny
TOYPACIFIC
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Thank you for this info. I’ll go over the link you added. If I have any other questions, I’ll be sure to get back to you. I appreciate this.
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Wednesday, March 6th, 2024 AT 8:01 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Hi,

You are very welcome. Take your time and if you need help, let me know.

Take care,

Joe
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Thursday, March 7th, 2024 AT 5:04 PM

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