The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - First hand experience with changing to the NBS master cylinder WOW!

speedygonzales · 12-19-2014, 05:38 PM

OK my RPO label says "JB5
I have 11" rear brake pads (I know cause I just changed them).
The booster label is "DA"

There is this from earlier
Vacuum-boosted:
JB5 = Power Brakes, Disc/Drum, 6,400 lb
JB6 = Power Brakes, Disc/Drum, 7,200 lb
JB7 = Power Brakes, Disc/Drum, 8,400 lb

The page posted by Keith lists under the JB7 column the booster as
18024268/DA
Is that the sticker on it?

If a JB5 is supposed to be the lesser of the three as far as power, why would a JB5 system have a JB7 booster?

Who can help with the booster I have?

12-19-2014, 05:38 PM	#117
speedygonzales Registered User Join Date: Jan 2006 Location: Smithfield, VA Posts: 1,501	Re: First hand experience with changing to the NBS master cylinder WOW! OK my RPO label says "JB5 I have 11" rear brake pads (I know cause I just changed them). The booster label is "DA" There is this from earlier Vacuum-boosted: JB5 = Power Brakes, Disc/Drum, 6,400 lb JB6 = Power Brakes, Disc/Drum, 7,200 lb JB7 = Power Brakes, Disc/Drum, 8,400 lb The page posted by Keith lists under the JB7 column the booster as 18024268/DA Is that the sticker on it? If a JB5 is supposed to be the lesser of the three as far as power, why would a JB5 system have a JB7 booster? Who can help with the booster I have? __________________ 99 Z71 (98 body style) Pride and joy