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Index > @ the Pickup Bed (General Topics) > Thread: Brake trouble
Thread: Brake trouble
DCMetts


Newbie
Posts: 3
posted December 07, 2007 10:43 AM

Brake trouble

hey I'm a new owner of a 72 REPU and am having some brake troubles... my baby has front disc brakes and rear shoe brakes and two wheel cylinders in each back wheel... i took it to the shop, but since I'm on the east coast no one has any clue what they're looking at. Their guess was master cylinder, but it was just replaced.... i was hoping you guys could help me out since you seem more informed.

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dhood


Hauling
Posts: 134
posted December 07, 2007 11:24 AM

Sounds like to took it to the Brake Dummies. Everything on the REPU is pretty much standard fare. Could you be a little more specific on the symptoms? Pedal fading, brakes locking up, whatever?

       
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dcmetts


Newbie
Posts: 3
posted December 08, 2007 07:47 PM

you can put the pedal to the floor and nothing... then it will go halfway down and catch or just act like a normal brake.

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roaddancer


Hauling
Posts: 127
posted December 08, 2007 09:13 PM

aair in system or maybe a leak down problem...if you pump it up does it slowly sink? that is a leak...if it holds then air in system.
72? not possible....but if it has disc front it must be. The REPU was the only and the first with that in a pu. Recheck the year.


____________
formerly
rx2/3/4/cosmo,repu,94 rx7,

       
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Klaus44


Redlining
Posts: 365
posted December 08, 2007 09:15 PM

Welcome to the Forum, DC!

(First off, the REPU wasn't offered prior to '74)...

If you, (or someone else, recently replaced the master cylinder, (and only the master cylinder), a couple of things might be likely: First off, is there any possibility that the master cylinder was not assembled and installed correctly? More likely, it sounds like maybe your brake system wasn't bled well enough post-install. Re-bleeding the entire brake system could be the cheapest, easiest remedy... if that's all it needs.
What may be worse: that new master cylinder might now be putting more of a strain on your other (aging) components. You may have had one or more wheel cylinders that were already compromised, that could now be leaking at an increased rate (?) Brake lines (especially the once-flexible hose sections) might also require a closer look. If proper bleeding of the system doesn't result in a lasting cure... inspect, rebuild, and or replace as needed. Remember that brake fluid is hydrophilic (attracts moisture) as well as corrosive, and does not improve with age...

The rear wheel cylinders sometimes have shown up online on Ebaymotors, etc. Some of the vintage import parts houses/sellers sometimes turn up parts like these.

Look elsewhere here on this Forum for an old thread entitled "aftermarket part numbers........" in which nwaco posted an extensive list (this dates to January 2004).
That thread/list includes a lot of aftermarket brake part #'s... including Gibson, Quickstop, Thermoquiet, and Wagner brands.

Best of luck!

       
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dhood


Hauling
Posts: 134
posted December 09, 2007 07:45 AM

Yeah sounds like air in the system, but this also happened to me with my rebuilt clutch master. Same symptoms, sometimes goes to floor, and pump it up to make it work then as you're holding the clutch, the truck begins to move! Got the cylinder sleeved and still the same problem. Replaced it again and same thing so surmised the Autozone rebuild kits are the wrong part for the application. Could be if you got a bad rebuild kit this is the same problem. I got a new kit from Napa and that fixed it.

But if air is in the system from an incorrect installation then a bleed will fix that. However, cheapest best fix always starts with an inspection. Look at the master where it meets the firewall both inside the engine bay and inside the passenger compartment for leaking. This could indicate a bad seal in the master. Look for leaks at each of the rear wheel cylinders and front calipers. If all is dry, maybe a leaking brake line, so check hoses and lines especially at the connections. A leak can also be where air can enter.

Besides knowing how to change oil and ignition parts, I think brake skills are the most important for a can do car owner.

Good luck!

       
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