Need help finding part number

randy627

Where is the number at on my break booster so I can order a new one. Its a 1988 GMC s-15 4.3 2x2

thecardoc3

You need the RPO code to tell which brake system you have. One possible location for the code list will be the glove box door.

The RPO codes and booster part numbers from NAPA are going to be JM5 (NAPA#) 547-1221, or JM3 (NAPA#) 5471084, or JM7 (NAPA#) 547-1152.

imidazol97

randy627 said:

Where is the number at on my break booster so I can order a new one. Its a 1988 GMC s-15 4.3 2x2

Look on rockauto.com. If you are sure what the problem is, they have the whole brake booster or just the check valve. It's in brakes, and named Power brake booster.

randy627

there are three different boosters for my truck I do not have the jm 35or7 pressed on my booster I need to know what to look for to identify it

rhinestonefuse

Try:

1. Go here: http://www.gmpartsnow.com
2. Enter you VIN