Power or manual

[Mackman]

Does this brake code (31) mean heavy duty manual brakes? 1969 GTX.

 

[Dartnut]

According to my books, B31 is 11'' manual adjustable drum brakes.
It also looks like the car didn't come with power brakes either, or it would have had a marking under B51 which would have automatically made it power disc brakes.
I hope this helps........

 

[33 IMP]

My book says Dartnut is entirely correct.
Those brakes require occasional manual adjustment with a brake spoon. They do NOT have self adjusters.

 

[Darter6]

Were they all that way? or was that only on the A12 cars ?

 

[33 IMP]

Were they all that way? or was that only on the A12 cars ?

I think all the HD 11" brakes. My a12 is definitely manual adjuster. Strangely, the ten inch drums on my 62 have self adjusters.

 

[33 IMP]

According to my books, B31 is 11'' manual adjustable drum brakes.
It also looks like the car didn't come with power brakes either, or it would have had a marking under B51 which would have automatically made it power disc brakes.
I hope this helps........

And the power disc's would have had ten inch drum rears, with self adjusters.

 

[R413]

All 66-69 b-body 11” brakes were manual adjust. So that’s all RR, GTX, RT, Super Bee, and every car that got the optional 11” drums. I had a 6 cyl 2door hardtop with it.

let’s leave taxi cabs out, I don’t have any info on them.

 

[Mackman]

This car is still 11” drums, manual adjust, but someone added a power brake booster. Brakes are very poor, doesn’t seem to generate enough braking power to safely stop the car. Trying to sort it out. All wheels are adjusted out enough.

 

[33 IMP]

It might not have the right master to use with a power booster. Personally, I'm not a fan of power brakes on a vintage car. I would go back to manual brakes, with a new manual master.