Brake systems... WTF?! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Baralheia · 06-18-2004, 01:03 AM

Okay, here's a doozie of a question. My truck originally came with heavy duty rear springs and heavy duty power brakes. My shop manual lists the different RPO codes for the different systems (i.e. JB1, JB3, JD5, etc), but the RPO code on my option sticker isn't in my book. What is the J55 heavy duty brake system? Would it be equivalent to the JB5 system?

From my shop manual:
System JB5 Low Drag - Front, Disc, 11.86 x 1.28 - Rear, Drum, 11.15 x 2.75 - Brake Assist, Vacuum, Dual Diaphragm

06-18-2004, 01:03 AM	#1
Baralheia Registered User Join Date: May 2004 Location: Edmond, OK Posts: 13	Brake systems... WTF?! Okay, here's a doozie of a question. My truck originally came with heavy duty rear springs and heavy duty power brakes. My shop manual lists the different RPO codes for the different systems (i.e. JB1, JB3, JD5, etc), but the RPO code on my option sticker isn't in my book. What is the J55 heavy duty brake system? Would it be equivalent to the JB5 system? From my shop manual: System JB5 Low Drag - Front, Disc, 11.86 x 1.28 - Rear, Drum, 11.15 x 2.75 - Brake Assist, Vacuum, Dual Diaphragm



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