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Old 09-01-2006, 09:17 PM
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very hard pedal 1/16 inch all that moves

well i did search nothing for this getting my t bucket close to driving but last time i drove it befor i took it all apart the brake pedal was hard to push (same as know) so while apart i had a new brake pedal assy put on ran all new lines to my 4 wheel drums no power booster brakes bleed the p@$s out of them got all air out but pedal still very hard i mean very hard travels only about 1/16 inch if i pull the rod the pedal moves great if i use large screw driver on master cyl it only moves about same as with pedal im not sure what size the master cyl is i do know its GM as are the brakes i went to part store today orderd a maual master cyl for a 70 impala but wanted to check see if its a waste of cash befor i pick it up the one i orderd has a 1 inch bore not sure what is on car any help would be great thanks

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Old 09-01-2006, 09:33 PM
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how far does it move with the bleeders open?
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Old 09-01-2006, 10:16 PM
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I had this very same problem, and it turned out with my car that the brake pedal was not coming back all the way. After you pumped the pedal a few times the pedal got harder and harder and the then the brakes locked up completely. Get the best light you have, pull the rubber dust boot back on the back of the master cylinder, and with no pressure on the brake pedal, look to see if piston in the master cylinder is all the way back. If it is not, you will have to adjust the rod, or in my case I had to shim the master cylinder forward to get it right. After I did this the brakes worked perfectly. Just an idea for you to try, and it will not cost you anything.
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Old 09-05-2006, 12:07 AM
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Since you are talkin drums instead of disc, you might just need to back off on the adjustment one or two turns.

Al
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Old 09-05-2006, 02:36 AM
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If the m/c matches the wheel cylinders - which at this point sounds like an unknown(GM has built MANY different drums), I'd look at the pedal assy's lever ratio. Lets assume that the pedal is not a 'swing type' so it 'grows' out of the floor, if the pushrod pivot pin is 2 inches from the pedal mounting shaft ( centre to centre) and the middle of the pedal is 10 inches from the shaft then you have a lever ratio of 5:1.
Check the lever ratio of the donor vehicle - maybe not a 70 Impala, and adjust your ratio to suit.
You must of course have already matched the front drums to rears and m/c to both. BTW if you order parts and don't pick them up, sonner or later nobody will order parts for you.
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Old 09-05-2006, 04:41 PM
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Try the http://www.nationaltbucketalliance.com/bb/ bbs post a message for "FatPat". He knows all there is in T bucket brakes and can help you with pedal ratios and all kinds of stuff.
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Old 09-05-2006, 04:57 PM
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the compensating port in the master cylinder is likely plugged, this is the port that allows the fluid to flow back in the resivore.
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