JA1 & JA2 Brakes

by 6000 SSEi


DISC BRAKE SYSTEM

A-Body Cars come with either JA1 or JA2 brakes. JA1 being light duty and JA2 being heavy duty. To check which brakes come on your car you can check the trunk and on the spare wheel cover it should have a list of all your PRO codes. Look for one of the two on that list.

JA1 being 5x100 Bolt pattern and JA2 5x115.

If your looking for a set of rims for your car from another GM vehicle the Beretta and Cavalier are two of cars that use the 5x100. Grand Prix and Regal are a couple cars that have the 5x115. (There are more cars in each wheel division then two)



Brake Caliper
Caliper Overhaul Kit
Front - Without AWD
Light Duty # 18011670
Medium and Heavy Duty # 18003724
With AWD # 18003724

Caliper Piston
Front - Without AWD
Light Duty # 18002866
Medium and Heavy Duty - No Listing
With AWD - No Listing

Brake Pad
Front Pads - With All-Wheel Drive # 12321422
Without All-Wheel Drive
Light Duty # 18024902 Medium and Heavy Duty # 12321422

Brake Rotor/Disc
Front Brakes - Without AWD Light Duty # 14046950 Medium and Heavy Duty # 18060226
With AWD # 18060226

Specifications

Table Note: All rotors have a discard dimension cast into them.
This is a wear dimension and not a refinish dimension. Any rotor which does not meet the specification should be
replaced.

DISC BRAKE SYSTEM
JA1 Fronts JA2/JA8 Fronts Rear
Rotor Diameter 9.72 in 10.24 in 10.237 in
Lateral Runout 0.004 in 0.004 in 0.004 in
Thickness Variation 0.0005 in 0.0005 in 0.0005 in
Rotor Thickness (Max) 0.885 in 1.043 in 0.494 in
Minimum Thickness 0.83 in 0.972 in 0.439 in
(after Refinish)
Discard Thickness 0.815 in 0.957 in 0.425 in

DRUM BRAKE SYSTEM

Brake Drum
Heavy Duty Brakes
Without Wagon # 88957254
With Wagon # 88957254
Standard Brakes #18021269

Specifications

Table Note: All drums have a discard dimension cast into Them. This is a wear dimension and not a refinish dimension.
Any drum which does not meet the specification should be replaced.

Inside Diameter 8.863 in
Runout 0.006 in
COUPE/SEDAN Maximum Re-bore Diameter 8.92 in
Discard Diameter 8.946 in
WAGON Maximum Re-bore Diameter 8.877 in
Discard Diameter 8.909 in

Brake Shoe
Brake Shoes and Linings # 18012418

Cylinder Overhaul Kit
Sedan # 18015236
With Wagon
Standard Duty # 18015235
Heavy Duty Brakes # 18031304