matthayes3741
Jan 21st, 12, 11:29 PM
I purchased a MPB rear disc conversion and am getting ready for installation... I downloaded the installation guide (I think) from them directly and found this note on page 5... Anyone ever heard of this?
"One of the biggest advantages of a disc type brake is that it has a fool proof self adjuster. Not so with the rear disc GM! The
rear calipers adjust off of the parking brake. The parking brake is incorporated into the caliper. You MUST set the parking
brake every time you park your car! Not many people do that nowadays because it is much easier to just put the transmission
in park and walk away! The rear caliper pistons utilize a "one way clutch" or "sprag" inside the caliper piston. When the
parking brake is applied the sprag senses when there is .030 or more clearance between the friction material on the inboard
side. When the distance is at least .030, the sprag turns inside the piston adjusting it out and keeping the rear brakes adjusted.
If you are not setting your parking brake with this setup EVERY time you park your car then two things will happen. #1 -
You will start to lose service brake pedal. #2 - The sprag will seize on the inside of the piston and will never work again.
NEVER buy these calipers from a rebuilder, because rebuilders use the old piston in most cases and the piston is the reason
the calipers were changed to begin with! Master Power Brakes uses only NEW calipers for this application! Also, when
replacing rear pads on these calipers, GM says to "get into the vehicle after you have installed the pads and apply the parking
brake 60 times". The short cut around this is to adjust the brakes out by unhooking the parking brake cable at the lever
and adjusting the pistons out using the parking brake lever and a .030 feeler gauge between the inboard pad and the rotor.
Then get in the vehicle and pump the parking brake 2-3 times."Here's a link to the website and installation guide:
http://www.mpbrakes.com/products/product-detail.cfm?product_id=479
http://www.mpbrakes.com/technical-support/installatin-guides.cfm
"One of the biggest advantages of a disc type brake is that it has a fool proof self adjuster. Not so with the rear disc GM! The
rear calipers adjust off of the parking brake. The parking brake is incorporated into the caliper. You MUST set the parking
brake every time you park your car! Not many people do that nowadays because it is much easier to just put the transmission
in park and walk away! The rear caliper pistons utilize a "one way clutch" or "sprag" inside the caliper piston. When the
parking brake is applied the sprag senses when there is .030 or more clearance between the friction material on the inboard
side. When the distance is at least .030, the sprag turns inside the piston adjusting it out and keeping the rear brakes adjusted.
If you are not setting your parking brake with this setup EVERY time you park your car then two things will happen. #1 -
You will start to lose service brake pedal. #2 - The sprag will seize on the inside of the piston and will never work again.
NEVER buy these calipers from a rebuilder, because rebuilders use the old piston in most cases and the piston is the reason
the calipers were changed to begin with! Master Power Brakes uses only NEW calipers for this application! Also, when
replacing rear pads on these calipers, GM says to "get into the vehicle after you have installed the pads and apply the parking
brake 60 times". The short cut around this is to adjust the brakes out by unhooking the parking brake cable at the lever
and adjusting the pistons out using the parking brake lever and a .030 feeler gauge between the inboard pad and the rotor.
Then get in the vehicle and pump the parking brake 2-3 times."Here's a link to the website and installation guide:
http://www.mpbrakes.com/products/product-detail.cfm?product_id=479
http://www.mpbrakes.com/technical-support/installatin-guides.cfm