Brake pedal squeak help and suggestions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**IT Cowboy** · Today, 08:37 AM

I have a brake pedal squeak I cannot find, I did a search here with not a lot of help. When I pump the brake pedal it is more of a chirping sound and it sounds like it is inside but I cannot tell. I have sprayed white grease and WD40 on the linkage under the dash and under the hood and no change. Possibly a worn bushing or the diaphragm in the booster? Any suggestions or ideas and maybe someone else has had this before.

**LockDoc** · Today, 11:11 AM

Quote:

Originally Posted by IT Cowboy

I have a brake pedal squeak I cannot find, I did a search here with not a lot of help. When I pump the brake pedal it is more of a chirping sound and it sounds like it is inside but I cannot tell. I have sprayed white grease and WD40 on the linkage under the dash and under the hood and no change. Possibly a worn bushing or the diaphragm in the booster? Any suggestions or ideas and maybe someone else has had this before.

OK, first off, and this is just my opinion, Ditch the White Lithium Grease (worst stuff you could ever use on a vehicle) and WD40 (unless it is the WD40 Penetrating oil) and get a good spray penetrating oil with Teflon in it like ZEP45, or something similar.

Does it make the noise with the truck running, stopped, or both?

There are two plastic bushings on the shaft that the Brake/Clutch pedals are attached to. Those may be worn out or really dry. Not saying that is your problem but it is a good place to start. Spray both ends of that shaft with the ZEP45 and press on the pedal a few times to work it in, and see what that does.

Report back.

**Sheepdip** · Today, 11:14 AM

If the booster is original, I would suspect that, a guy like me would live with it until it very obviously failed, but that's just me.

72c20customcamper · Today, 11:46 AM

Bushings are probably gone. # 5 in the parts diagram
https://www.lmctruck.com/mechanical/...dal-components

**IT Cowboy** · Today, 11:49 AM

Quote:

Originally Posted by 72c20customcamper

Bushings are probably gone. # 5 in the parts diagram
https://www.lmctruck.com/mechanical/...dal-components

Do I need to be a contortionist to change them and is it a 6 pack job

72c20customcamper · Today, 11:53 AM

Quote:

Originally Posted by IT Cowboy

Do I need to be a contortionist to change them and is it a 6 pack job

Yes .

**Steeveedee** · Today, 01:50 PM

Indeed. Maybe take the seat out first?

**LockDoc** · Today, 05:26 PM

Quote:

Originally Posted by IT Cowboy

Do I need to be a contortionist to change them and is it a 6 pack job

-
There is a bolt on the right side of the bracket by the tube that goes through the brake pedal. You have to remove the bolt and pull (pry) the pivot tube out of the bracket. The pedal will then pull down out of the bracket. Watch the spring it is a tough one.

LockDoc

**MySons68C20** · Today, 06:07 PM

Quick and nasty may be a shot of motorcycle chain lube.....goes in thin and sets up to a lightweight grease. YMMV.

Today, 08:37 AM	#1
IT Cowboy Senior Member Join Date: Jan 2025 Location: Clarkdale, Arizona in a van down by the river Posts: 243	Brake pedal squeak help and suggestions I have a brake pedal squeak I cannot find, I did a search here with not a lot of help. When I pump the brake pedal it is more of a chirping sound and it sounds like it is inside but I cannot tell. I have sprayed white grease and WD40 on the linkage under the dash and under the hood and no change. Possibly a worn bushing or the diaphragm in the booster? Any suggestions or ideas and maybe someone else has had this before. __________________ '72 C10 / 402 ___________________________________________ Freedom isn't safe, it requires you to take responsibility for your own life, your own safety, and your own success. It carries with it the possibility of failure and the understanding that you're working without out a safety net. If you give the state the responsibility for any of these you also give up the freedom that accompanies the responsibility.

Today, 11:14 AM	#3
Sheepdip Senior Member Join Date: Nov 2018 Location: Waterford California Posts: 2,690	Re: Brake pedal squeak help and suggestions If the booster is original, I would suspect that, a guy like me would live with it until it very obviously failed, but that's just me.

Today, 11:46 AM	#4
72c20customcamper Registered User Join Date: Jul 2018 Location: Catskill Mountains,NY Posts: 8,867	Re: Brake pedal squeak help and suggestions Bushings are probably gone. # 5 in the parts diagram https://www.lmctruck.com/mechanical/...dal-components Attached Images __________________ Mark 72 c20 custom camper Husky edition, 66 SS396 Chevelle 1964 Hawk, 63 Avanti,62 lark 1969 AMX , 1968 c20 stepside ,85 K20 1977 Suburban sold 68 anniversary.

Today, 01:50 PM	#7
Steeveedee Who Changed This? Join Date: Jan 2013 Location: Simi Valley, CA Posts: 10,886	Re: Brake pedal squeak help and suggestions Indeed. Maybe take the seat out first? __________________ ~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA

Today, 06:07 PM	#9
MySons68C20 Senior Member Join Date: Sep 2014 Location: Wenatchee, Wa Posts: 967	Re: Brake pedal squeak help and suggestions Quick and nasty may be a shot of motorcycle chain lube.....goes in thin and sets up to a lightweight grease. YMMV.



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