8.8 rear w/disc swap--Master Cyl - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 08-14-2018, 01:02 PM   #1 (permalink)
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8.8 rear w/disc swap--Master Cyl

Got everything in and welded, pedal is a little spongy but stops. Would like to get a real pedal. Mater cylinder upgrade recommendations?
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Old 08-15-2018, 04:01 AM   #2 (permalink)
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What vehicle and what is the current booster and MC?

Sounds like you need to bleed the brakes better.
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Old 08-15-2018, 08:11 AM   #3 (permalink)
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yeah, never had an issue with my 8.8 in a TJ with stock crap
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Old 08-15-2018, 08:27 AM   #4 (permalink)
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1993 YJ feels like it needs more pedal. Doesn't feel like it really wants to stop, just slow down. Brakes are bled just fine, fluid nice and clean.
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Old 08-15-2018, 08:28 AM   #5 (permalink)
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Ran the stock one MC in my TJ when I swapped in a Disc brake 8.8 from a drum brake D35.

Make sure your bleeder screws are on top. I made the mistake of swapping calipers and the bleeder screw was below the brake line, causing an air pocket that would not bleed out, and similar issues.
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Old 08-15-2018, 11:22 AM   #6 (permalink)
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You could upgrade the booster and MC to the dual diaphragm setup from the 1995 YJ. That should be an improvement over what came on the 1993.

I don't think spongy brakes are due to the MC unless you damaged it while bleeding the brakes. Its typically air still in the system somewhere.
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Old 08-15-2018, 12:16 PM   #7 (permalink)
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So on with my original question... master cylinder upgrade? from disc/drum to disc/disc. In my research I came up with a builder that uses a MC from a 78 Ford with 4 wheel disc, but I found is doe snot fit correctly without bending the crap out of the clamp that holds the lid tight. I'm thinking I need more than a 1'' piston in the MC and a bigger reservoir would be nice for the rear
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Old 08-15-2018, 12:33 PM   #8 (permalink)
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Your booster isnít meant to drive a bigger bore MC. You will get the firm short pedal you seem to be after at the expense of less PSI at the calipers. But good luck.
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