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**Bob B.** · 01-07-2006, 05:04 AM

Be careful! '67 to '70 trucks use Bendix boosters, and the master cylinders have a deep hole in the piston for the booster pushrod. '71 and '72 trucks use a Delco booster. Some Delco boosters have a shorter pushrod, and the master cylinder has a very shallow hole for the pushrod. If you use one of these Delco boosters with one of the earlier master cylinders, you could end up with too much play between the booster pushrod and the master cylinder piston, which could give you a very low or no brakes at all.

01-07-2006, 05:04 AM	#7
Bob B. Senior Member Join Date: Aug 2005 Location: Los Angeles Posts: 1,396	Re: Adding power to my powerless brakes Be careful! '67 to '70 trucks use Bendix boosters, and the master cylinders have a deep hole in the piston for the booster pushrod. '71 and '72 trucks use a Delco booster. Some Delco boosters have a shorter pushrod, and the master cylinder has a very shallow hole for the pushrod. If you use one of these Delco boosters with one of the earlier master cylinders, you could end up with too much play between the booster pushrod and the master cylinder piston, which could give you a very low or no brakes at all. __________________ 1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90.