87 GMC Sierra power brake master cylinder bore size? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Joe69C10 · 10-21-2013, 02:35 PM

Hey guys, just picked up am 87 GMC over the weekend. Brake pedal if very mushy, pedal travels very far, and it seems to stick or come up slow.

I was thinking about replacing the master cylinder and re-bleeding the system.

Autozone.com sells 2 with different bore sizes. 1.57 and 1.41 Bore. Besides this they both look the same. Does anyone know which one would work best? Or should I remove the one that's currently on the truck to verify?

Thanks!

Joe

10-21-2013, 02:35 PM	#1
Joe69C10 Registered User Join Date: Jul 2012 Location: Ocala,FL Posts: 129	87 GMC Sierra power brake master cylinder bore size? Hey guys, just picked up am 87 GMC over the weekend. Brake pedal if very mushy, pedal travels very far, and it seems to stick or come up slow. I was thinking about replacing the master cylinder and re-bleeding the system. Autozone.com sells 2 with different bore sizes. 1.57 and 1.41 Bore. Besides this they both look the same. Does anyone know which one would work best? Or should I remove the one that's currently on the truck to verify? Thanks! Joe



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