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Posted by Terry [70.51.96.27] on Friday, January 15, 2010 at 20:58:21 :
In Reply to: Hydro boost question posted by John S [141.158.97.74] on Friday, January 15, 2010 at 18:32:59 :
A quick check of NAPA shows numerous hydroboost units. The heavier ones are the JB8 versions with motor home chassis. NBB 527257 fits a 89 P-30 1 ton. This is front disc/rear drum. NBB527256 is the same but JB8 for forward chassis truck. NBB529383 is for the heaviest one with 4 wheel disc and motor home chassis , NBB529384 is for the forward chassis version. ALL hydroboost units show the larger master cylinder (1- 5/16") UP39435 which is the same as the one Paul picked. I wonder if the internal parts on Paul's list would be the same as these above ones. I know I went to get parts and they are now out of stock. Maybe this truck uses different springs and retainer parts, that we can now get easier. Terry
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