1977-1979 Ford and Mercury - 1977 brake sizes

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1977 brake sizes

Printed From: The Ford Torino Page
Category: Model Specific Forum
Forum Name: 1977-1979 Ford and Mercury
Forum Description: Technical discussion for 1977-1979 Ford and Mercury
URL: https://forum.grantorinosport.org/forum_posts.asp?TID=5306
Printed Date: 26-March-2026 at 5:42PM
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Topic: 1977 brake sizes

Posted By: Turbo301
Subject: 1977 brake sizes
Date Posted: 03-April-2011 at 1:35PM

I read that the non-station wagons have 2 1/4" drums, but when I took mine off today to measure, they were closer to 2.5", like the station wagons. Am I measuring the right area, or did XR-7s get the station wagon size because of the "heavy duty" suspension?

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1977 Cougar XR7
1980 turbo Trans Am
2009 Pontiac G8 GT

Replies:

Posted By: Regul8r
Date Posted: 03-April-2011 at 1:43PM

Measure across the brake shoe.

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Carl Corey (Moderator/Event Coordinator) Contact ANYTIME!
1976 Ford Elite "Lola Mae"
97 Suzuki Intruder 1400
US Army Retired

Posted By: Turbo301
Date Posted: 03-April-2011 at 2:06PM

Ah, okay, that makes sense. When I check the drum, too, it is 2.5" edge-to-edge, but the actual fully-finished surface is only about 2.25".

Thanks for the clarification!

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1977 Cougar XR7
1980 turbo Trans Am
2009 Pontiac G8 GT