| Re: [GMCnet] Harrison Brakes [message #329426 is a reply to message #329419] |
Thu, 22 February 2018 20:35   |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma:
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Senior Member |
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James,
From your photos and the part numbers supplies I believe the calipers you used are what is referred to as 80mm. According to TSM the
pistons are actually 3 1/32in or 76.9938mm.
http://www.tsmmfg.com/More.../3020.html
I have them on the front and middle wheels of Double Trouble; however, I have the Caddy caliper mounting plates and smaller rotors
on the middle wheels as per:
http://www.gmcmhphotos.com/photos/g3119-cadilac-disk-brakes.html
Sammy,
Yes, there are calipers with built in parking brakes:
1) 2 1/32in piston = 51.5938mm http://www.tsmmfg.com/More.../3110.html
2) 2 13/32in piston = 61.1188mm http://www.tsmmfg.com/More.../3120.html
3) 2 1/32in piston = 61.1188mm http://www.tsmmfg.com/More.../3121.html
However, GMC "folklore" notes these calipers can cause problems if they are not maintained properly as the parking brake function
will not release.
BTW you can find all these calipers on RockAuto for a hell of a lot less than the major auto parts chains or TSM.
Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of James Wack
Sent: Friday, February 23, 2018 9:55 AM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Harrison Brakes
My setup is Leigh Harrison upgrade to disk brakes on the forward rear axle with OEM drums & parking brake on the rear axle. List
compiled during my own rebuild effort this past November:
1. Rotors: Duralast 5445 (Autozone) or NAPA Premium NB 4885731/NB4885978
Fitment from 1993 (and other years) Ford F250 front rotor
2. Calipers: Cardone 18P4122 (Right) and 18P4123 (Left)
Fitment from 1984 Chevrolet C20 Pickup
3. Pads: Performance Friction 0052.20 Carbon Metallic
4. Wheel Bearings Inner: = Timken Set45 (Timken LM501310 Race & LM501349 Bearing)
Wheel Bearings Outer: = Timken 15243 Race & 15103S Bearing
Bearing Seal: Timken 8974S
Photos here: http://www.gmcmhphotos.com/photos/g7122-leigh-harrison-rear-brake-maintenance.html
--
Wackster - 1976 23' Crestmont
Baltimore, Maryland
Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Sammy Williams
Sent: Friday, February 23, 2018 10:04 AM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Harrison Brakes
Isn't there a set of calipers one could use from a heavy duty truck that
would provide parking brake capability? I do know the Ford super duty has
four wheel disc brakes.
Sammy Williams
Thinking out loud
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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