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mgchevyparts · 01-02-2020, 07:29 PM

Your calipers are 1988-91 Chevy/GMC 1500 light duty (not extended cab) 2.5" piston
4301/4302 are common part numbers for the calipers.
You can't just change calipers without making at minimum new brackets, essentially you need to re-design an entire kit.
Those calipers are plenty adequate for your truck. You have a problem in the hydraulic delivery, AKA master-booster-possibly your plumbing or AIR in system
You should be using a 1 1/8" bore master, although a 1" will also work but with too much pedal travel.

01-02-2020, 07:29 PM	#10
mgchevyparts Registered User Join Date: Feb 2013 Location: Upland, Calif Posts: 698	Re: which front brake calipers Your calipers are 1988-91 Chevy/GMC 1500 light duty (not extended cab) 2.5" piston 4301/4302 are common part numbers for the calipers. You can't just change calipers without making at minimum new brackets, essentially you need to re-design an entire kit. Those calipers are plenty adequate for your truck. You have a problem in the hydraulic delivery, AKA master-booster-possibly your plumbing or AIR in system You should be using a 1 1/8" bore master, although a 1" will also work but with too much pedal travel. __________________ 1957 CHEVY 1/2 TON SHORT BED 1940 FORD 1/2 TON SHORT BED Last edited by mgchevyparts; 01-02-2020 at 07:37 PM.