Quote:
Originally Posted by buildinga55
I bought a kit that included the booster, master cylinder, brackets etc. for a 66 chevy pickup. I split the brake line at the T on the passenger side and ran a new one to the new MC, I have done this a few times worked well. I cannot seem to get the brakes bleed. I even went and bought another master cylinder thinking the one in the kit was bad. I have bench bled it 3 times, checked all fittings, fluid will gravity flow out of the bleeders, but pedal goes to the floor and will barely even stop the truck at 5 miles an hour. I am at the point I dont know what to do. I have never had this issue bleeding brakes, I have probably bled brakes on 50 cars in my life and never had this trouble. I bought a booster for Drum Drum brakes since that is what I have on the truck. Any ideas?
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First, re-think your fluid-line setup/design and be sure it makes sense, as it's easy to err in its design. Linkages must be correct--including pedal to booster, AND booster-to-master. If you have mis-matched mc-and-booster, a *plug-spacer* may need to be slipped into the rear of the mc piston; else, the booster-shaft may enter too deeply into the mc piston, ending up with a too-short booster-shaft. *This plug-spacer can be easily made from the shoulder of a bolt, once you see just what is needed--using only a hacksaw and a bench grinder [and if you're quite picky, you may wanna use a big drill bit to slightly indent the booster-end of this plug-spacer].
Next BIG thing touted so much on our forum is the necessity of pressure-bleeding the system. Many have found no joy until they pressure-bled their system. This utilizes a pressure source to apply pressure to system thru top of master cylinder. Google will show you how to build such a 'tool'. Also, you may find an affordable one to buy at Harbor Freight. You may find the most economical way, for maybe a one-time application, is to take it to a shop that has their own pressure-bleeding system.
If you wish to know ALL the ramifications, do a search on here: you should find just about all the ideas, all the workable solutions, and all the failing solutions that one could want. Good reading, by the way, and lotsa replies to such threads.
Maybe start reading here, seeing a write-up and pics I replied to earlier:my replies at #3 and #5.
>>
http://67-72chevytrucks.com/vboard/s...d.php?t=566217 <<
#5 shows 2 mc's--left one with no hollow in mc-piston, NOT needing a spacer-plug (regardless of booster), and
requiring a booster with the
short shaft. Right one shows a mc with the deep-hollowed-piston, which MAY need a spacer-plug (
DOES require it IF the booster has the
SHORT shaft going to mc--does
NOT require spacer IF booster has the
LONG shaft going to mc).
HTH,
Sam