Question on Brake ID

[Sytar 69]

I own a 1983 Chevy C10 pickup with a 6.2 diesel and need to know how to ID the brake system that is in ita As right now I do not have any brakes that work. Every part store that I go to ask me what brake system I have. They say there is a tag in the engine compartment or on the glove box door that tells you. I can not find any tag or information anywhere that says which system I have. I do know that I have a Hydro Booster on it and so I am turning to you folks for help. Thank You in advance for the help. Scot

[Sytar 69]

Anyone? Doesn't anyone know?

[1987SierraClassic]

Sytar 69,

Most parts stores will go by the RPO code. It's on the glove box and for '87 anyway, begins with a "J". When I ordered brakes for my 1987, I just told them "1987 GMC 1500 4x4 with JB5 brakes" and they gave me exactly what I needed...they even gave me the jobber price just because I knew what I was talking about!

Here are the RPO codes for GM Trucks...I think they pretty much cover all the years that style was built...but it should get you closer to an answer...you can always google "GM RPO CODES"...

Hope these help...

J1F : BRAKE PROVISION SPECIAL TO SUIT FOREIGN REGULATION
J41 : BRAKE SYSTEM, PWR, FRT DISC, RR DRUM, CAST IRON
J42 : BRAKE SYSTEM, PWR, FRT DISC, RR DRUM, ALUMINUM
J50 : BRAKE SYSTEM, POWER
J52 : FRONT DISC BRAKES
J55 : BRAKE SYSTEM, HEAVY DUTY
J56 : SPECIAL HEAVY DUTY BRAKE PACKAGE
J61 : DRUM BRAKES
J65 : BRAKE SYSTEM, PWR, FRT & RR DISC
J81 : INDICATOR SWITCH, EXPORT
J85 : BRAKE SYSTEM, PWR, FRT & RR DISC
JA1 : BRAKE, LIGHT WEIGHT DISC DRUM
JA2 : BRAKE, HEAVY WEIGHT DISC DRUM
JA3 : BRAKE, SYSTEM, WAGON DISC DRUM
JA4 : BRAKE, SYSTEM, PWR FRT DISC, RR DRUM, CAST IRON
JA5 : BRAKE, SYSTEM, SPORT COUPE DISC DRUM
JA6 : BRAKE, EXTRA LIGHT WEIGHT DISC DRUM
JA7 : HANDLE, PARK BRAKE RELEASE, LEATHER
JA8 : BRAKE, MEDIUM WEIGHT DISC DRUM
JAF : BRAKE, PROVISIONS EUROPE
JB1 : BRAKE, MANUAL, DISC/DRUM, 4300 LBS
JB3 : BRAKE, POWER, DISC/DRUM, 4600 LBS
JB5 : BRAKE, POWER, DISC/DRUM, 6400 LBS
JB6 : BRAKE, POWER, DISC, DRUM 7200 LBS
JB7 : BRAKE, POWER, DISC, DRUM 8400 L85
JB8 : 8RAKE, POWER, DISC, DRUM 10000 LBS
JC4 : BRAKE, POWER, DISC, DRUM 5600 LBS
JC5 : BRAKE, VAC POWER, 4-WHEEL DISC, 7200 LBS
JC7 : BRAKE, POWER, DISC/DRUM, 12000 LBS
JCB : BRAKE, POWER, DISC/DISC, 20000 LBS
JD3 : BRAKE, HYD POWER, DISC/DRUM
JD5 : BRAKE, DUAL POWER, DISC/DRUM, 6400 LBS
JD6 : BRAKE, HYD POWER, DISC/DRUM, 7200 LBS
JD7 : BRAKE, HYD POWER, DISC/DRUM, 8400 LBS
JE1 : BRAKE, SYSTEM, EUROPE
JE5 : BRAKE, SYSTEM, PWR, ANTILOCK, FRT & RR WHL
JF9 : BRAKE, HYD POWER, 4 WHEEL DISC
JG1 : SHAFT, PROP, ALUMINUM
JH5 : BRAKE, HYD POWER, 4-WHEEL DISC, 7200 LBS
JH6 : BRAKE, HYD POWER, 4-WHEEL DISC, 9900 LBS
JL2 : BRAKE, FRT DISC, SINGLE PISTON
JL4 : ACTICE HANDLING
JL6 : BRAKE, SYSTEM, MAN, FRT DISC, RR DRUM, CAST IRON
JL8 : FRONT & REAR DISC BRAKES
JL9 : BRAKE, SYSTEM, PWR, FRT a RR OISC, ANTILOCK, FRT W
JM3 : BOOSTER, BRAKE, 240MM TANDEM, HIGH FLOW
JM4 : BRAKE, SYSTEM, PWR, FRT DISC, RR DRUM, CAST IRON,
JM5 : BOOSTER, BRAKE, 200MM TANDEM, HIGH FLOW
JM7 : BOOSTER, BRAKE HYD HI PERF, DELCO-MORAINE
JM8 : BRAKE SYSTEM PWR, FRT DISC RR DRUM, ALUMINUM,

[Sytar 69]

Sierra, my problem is that I do not have the sticker anywhere on the truck. I looked in,on the glove box, and I looked everywhere in the engine compartment and nothing is there anywhere. Could the title or the VIN tell me anything? Scot

[Captkaos]

Pull the wheel off and measure the rotor. There are only 2 options. Standard (1" thick rotor) or Heavy Duty (1.25" rotor)

Being a Diesel with Hydroboost, I am betting it is HD...

[Sytar 69]

So would that be a JB5,JD3,JD5 or JB1 ,JB3. The first three are together on the part store web site and the other two are together, I think the first three are the heavy duty system. I am going to replace the whole system from front to back and need to figure out which system I have as I live 65 miles from the closest part store.

[1987SierraClassic]

I found this chart to help with physical ID if the sticker is gone...

GM LIGHT-DUTY
GM Light Duty Truck Brake Options: 1984 and later. Brake system replacement parts for GM light duty
vehicles depends on which production option is installed on the truck. Either one of two methods can be
used to determine which option applies:
Method 1:
The service parts identification label (SPIL) lists what options are on the truck. The physical location
varies by series:
- C, K, R, S, T, V Series: The SPIL is located on the inner surface of the glove compartment door or on the
left front inner fender skirt.
- G Series: Inner surface of the hood panel.
- M Series: Inner surface of the glove compartment door.
- P Series: Not adhered to the truck at the factory, but mailed to the dealer. If possible, contact dealer for
placement.
Method 2:
Physical examination using the following specifications:
Engine Front Rotor Rr Drum/Rotor Power Booster Production #
Gas 11.86" x 1.28" 11 x 2" None JB1
Gas 11.86" x 1.28" 11 x 2" 9.5" Single Diaphragm JB3
Gas 11.86" x 1.28" 11.15" x 2.75" 9.5" x 8" Dual Diaphragm JB5
Gas 12.5" x 1.28" 11.15" x 2.75" 9.5" x 8" Dual Diaphragm JB6
Gas 12.5" x 1.28" 13" x 2.50" 9.5" x 8" Dual Diaphragm JB7
Gas & Diesel 12.5" x 1.53" 13" x 2.50" Hydro-boost JB8
Gas 14.25" x 1.53" 15" x 4" Hydro-boost JB9
Diesel 11.86" x 1.28" 11" x 2" Hydro-boost JD3
Diesel 11.86" x 1.28" 11.15" x 2.75" Hydro-boost JD5
Diesel 12.5" x 1.28" 11.15" x 2.75" Hydro-boost JD6
Diesel 12.5" x 1.28" 13" x 2.50" Hydro-boost JD7
Gas & Diesel 14.25" x 1.53" 13.75" x 1.53" Hydro-boost JF9 (4 wheel
disc)

Here's the link. Make the chart easier to read/print...

http://www.arvinmeritor.com/tech_lib...tents_1-19.pdf

[Sytar 69]

Thanks, With the information that you all have given me I now can replace my brakes.Funny think is I contacted Chevy and never received a answer. Scot