No parking brake?

Pete_89T2 · 10-20-2015, 07:46 AM

Interesting... I thought the bottom bleeder screw was there simply there to help purge accumulated crud out of the caliper when pressure flushing & bleeding. Given the way this caliper is designed and oriented on the car, you can see there's a low point that would tend to trap & accumulate crud, so I figured the extra bleeder was there to deal with it.

Whenever I flush & bleed brakes on the FC, for the rears I open the bottom screw first (top closed) to flush out the crud. When fluid flows out clear & clean from there, I close the bottom screw & open the top one to purge the air out.

FC Zach · 10-20-2015, 08:10 AM

Double checked my manual and found this but nothing in detail regarding why the bottom is used. .

infernosg · 10-21-2015, 07:11 AM

Quote:

Originally Posted by FC Zach

Double checked my manual and found this but nothing in detail regarding why the bottom is used. .

Interesting. Is that in the Haynes manual? I have a paper copy of the FSM and I don't recall seeing that. I'll give it a try because I definitely fall into the category of having "overhauled" the calipers. The worst that can happen is the parking brake still doesn't work. I've discovered some older RX7 racecars have deleted the parking brake system so I'm not too concerned at this point.

EDIT: It shows up in the FSM for the '88 MY but not in the FSM for the '89 MY. More interesting...

On a somewhat related topic does anyone know how to actually adjust the brake pedal "free play?" I've swapped to the 929 MC and booster and the pedal free play is out of spec according to the FSM. The FSM instructions for adjusting pedal height and free play are the same. In order to get the free play in spec I have to adjust the brake pedal all the way out, which puts the pedal height out of spec. I don't see how to get the free play in spec without violating the pedal height spec. Maybe the 929 free play specs are different...

RETed · 10-20-2015, 12:05 PM

Quote:

Originally Posted by Pete_89T2

Interesting... I thought the bottom bleeder screw was there simply there to help purge accumulated crud out of the caliper when pressure flushing & bleeding. Given the way this caliper is designed and oriented on the car, you can see there's a low point that would tend to trap & accumulate crud, so I figured the extra bleeder was there to deal with it.

+1

I agree - it's due to the orientation of the brake caliper being almost vertical.

-Ted

10-20-2015, 07:46 AM	#1
Pete_89T2 Lifetime Rotorhead Join Date: Apr 2010 Location: Elkton, MD Posts: 874 Rep Power: 16	Interesting... I thought the bottom bleeder screw was there simply there to help purge accumulated crud out of the caliper when pressure flushing & bleeding. Given the way this caliper is designed and oriented on the car, you can see there's a low point that would tend to trap & accumulate crud, so I figured the extra bleeder was there to deal with it. Whenever I flush & bleed brakes on the FC, for the rears I open the bottom screw first (top closed) to flush out the crud. When fluid flows out clear & clean from there, I close the bottom screw & open the top one to purge the air out.