FWIW I gathered the following notes but can't vouch for accuracy as I
haven't done this yet.
REAR DISK BRAKES *****
Obtain rear brake set from 76, 77, or 78 El Dorado or Seville.
Backing plates, emergency brake return spring and spring holder mounted on
back of backing plate are needed too.
It will take two junk cars per GMCMH.
The emergency brake, when set, mechanically puts pressure on the pads.
These use a 2.5" caliper, similar size as stock GMCMH front brakes.
Other than the backing plate, all parts are available rebuilt or new from
NAPA.
The backing plate and rotor center holes have to be enlarged (machined) to
fit the GMCMH.
4 more holes are drilled in the 4 lug rotor to fit the 8 lug GMCMH wheel or
else GMCMH front rotors can be used.
GMCMH stock front 2.5" caliper parts can be used on rear if you dont want
parking brakes.
It takes more force to set the parking brake. The three stock guide wires
are replaced with aluminum pulleys to reduce parking brake cable friction.
Even with this modification, more force would be useful.
A larger master cylinder from Chevy P-30 chassis and adjustable brake rod
(in chamber between master cylinder and brake booster) (or a rod cut to
length), I believe, 0.010 " longer than original is required.
Master cylinder (34 mm): GM 14009146 39-622 F103239
A master cylinder mounting bracket needs to be fabricated in addition.
Proceed at your own risk as I have heard any alterations to your brake
system using parts not certified as part of the original system voids DOT
certification.
If true, this could bring on the wrath of the legal system in case of an
accident, but what are the chances?
In such an event, would it help get the owner off the legal hook if he had
purchased an after market system instead of building his own from junk yard
parts ?
Anyone know if you can get federal field approval for changes like these ?
Since the FAA does, it would seem DOT might also.
Don Miller
Shenandoah Valley of Virginia
haven't done this yet.
REAR DISK BRAKES *****
Obtain rear brake set from 76, 77, or 78 El Dorado or Seville.
Backing plates, emergency brake return spring and spring holder mounted on
back of backing plate are needed too.
It will take two junk cars per GMCMH.
The emergency brake, when set, mechanically puts pressure on the pads.
These use a 2.5" caliper, similar size as stock GMCMH front brakes.
Other than the backing plate, all parts are available rebuilt or new from
NAPA.
The backing plate and rotor center holes have to be enlarged (machined) to
fit the GMCMH.
4 more holes are drilled in the 4 lug rotor to fit the 8 lug GMCMH wheel or
else GMCMH front rotors can be used.
GMCMH stock front 2.5" caliper parts can be used on rear if you dont want
parking brakes.
It takes more force to set the parking brake. The three stock guide wires
are replaced with aluminum pulleys to reduce parking brake cable friction.
Even with this modification, more force would be useful.
A larger master cylinder from Chevy P-30 chassis and adjustable brake rod
(in chamber between master cylinder and brake booster) (or a rod cut to
length), I believe, 0.010 " longer than original is required.
Master cylinder (34 mm): GM 14009146 39-622 F103239
A master cylinder mounting bracket needs to be fabricated in addition.
Proceed at your own risk as I have heard any alterations to your brake
system using parts not certified as part of the original system voids DOT
certification.
If true, this could bring on the wrath of the legal system in case of an
accident, but what are the chances?
In such an event, would it help get the owner off the legal hook if he had
purchased an after market system instead of building his own from junk yard
parts ?
Anyone know if you can get federal field approval for changes like these ?
Since the FAA does, it would seem DOT might also.
Don Miller
Shenandoah Valley of Virginia
