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#1
09-20-2013, 10:36 PM
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65 GP brake cylinder size help, please
My left rear brake is spewing brake fluid. I attempted to order rebuild kit online and got questioned? this size or that? Like maybe 1 1/2 or 1 and 5/8 etc?
I thought this was a simple swap repair, Is it more complicated? I can't see myself taking the rear hub apart and using a tape measure to justify a 1/8" difference. Anybody know the real answer? This purchase is keeping me off the road, cause I can't get stuck in the middle and leave the car setting outside waiting on me to get it right. DJ 
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1965 Grand Prix 2002 GMC Sierra Denali (4 wheel steering is highly underrated) The views and opinions expressed by me in no way reflect the views and policies of General Motors. |
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#2
09-20-2013, 11:28 PM
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rear is a 15/16" bore and is a real common wheel cylinder, used on a lot of 1/2 ton chevy trucks. you should be able to get a whole new wheel cylinder for $5 ($4 at rock auto)
Fronts are 1 3/16 bore and are different LH and RH and unique to the big pontiacs.
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65 Bonneville Brougham 4DHT 65 Grand Prix 2DHT......now parts 65 Catalina 2+2 2DHT 65 Catalina Safari 4DSW |
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#3
09-21-2013, 06:56 AM
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Like Jayhawk said put a new one in it. Wouldnt be a bad idea to at least do both rear or better all four
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#4
09-21-2013, 08:46 AM
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Agreed with Jayhawk and Txbobcat
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Never trust anything that bleeds for five days and won't die. |
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#5
09-21-2013, 12:19 PM
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Dorman P/N 's:
Rear W51081 ($3.96 at rock auto) L Front W37046 ($31.79 at rock auto) R Front W37047 ($31.79 at rock auto) Fronts are 65-66 full size Pontiacs only so if you see fronts that have a lot of chevy applications I don't think they will work.
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65 Bonneville Brougham 4DHT 65 Grand Prix 2DHT......now parts 65 Catalina 2+2 2DHT 65 Catalina Safari 4DSW |
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#6
09-21-2013, 01:13 PM
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Rock auto always has a 5% off code out there also. Current one is
6892D28E6E22
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Brad Hansen 65 Cat Ventura, 66 Cat Vert, 63 GP |
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#7
09-21-2013, 11:02 PM
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I believe our host Performance Years has them also. I like to get my Pontiac parts from a Pontiac vendor when I can. They support the hobby so I support them.
Jim
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65 Catalina sedan. Allen Thomas Performance 495. KRE Heads at 310cfm ported by SD Performance, ProSystems Dominator carb on ported Victor intake, P-Dude custom grind hydraulic roller, MSD ignition, 3.50 Moser/Ford rear. F-Glass front bumper by son Rob, rear by the old man and joint effort for trunk lid. 3950# w/driver. Best of 9.5761/139 on 175 shot, 6.01 /114 in 1/8. |
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#8
09-23-2013, 02:21 PM
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I find it handy to reference NAPA's website when it comes to questions like this..they tend to offer a little more technical detail and sometimes better photos than the chain store websites.
http://www.napaonline.com/Catalog/Ca...048_0205445981
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Red\black 65 Grand Prix 467 E-head stroker, Viper T-56 6-speed, 4.10 spool |
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#9
10-04-2013, 11:32 PM
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Looks like I reposted this question, but 15/16" wasn't one of my choices..........
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1965 Grand Prix 2002 GMC Sierra Denali (4 wheel steering is highly underrated) The views and opinions expressed by me in no way reflect the views and policies of General Motors. |
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#10
10-05-2013, 09:52 AM
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Oh, oh, domino...
If you have the extra dough, you may be better to replace the wheel cylinders entirely.
Of course, doing so will probably lead to new lines in the back. And then new hoses (all 3). Then a new master cylinder and a booster rebuild. ...cheap insurance, in my opinion...
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RediRad circuit designs, branding and intellectual property are for sale. Serious inquiries only. |
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