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Master cylinder question #3180543 10/03/23 11:18 AM 10/03/23 11:18 AM
Joined: Aug 2006 Posts: 813 ar. B bobs69 OP super stock
bobs69 OP super stock B Joined: Aug 2006 Posts: 813 ar.	What master cylinder for 4 wheel manual disc? Thanks

Re: Master cylinder question [Re: bobs69] #3180550 10/03/23 12:01 PM 10/03/23 12:01 PM
Joined: Oct 2005 Posts: 269 Anchorage, Alaska metallicareload enthusiast
metallicareload enthusiast Joined: Oct 2005 Posts: 269 Anchorage, Alaska	I’m using a 15/16” master cylinder from Doctor Diff with my manual 4 wheel discs, pedal takes a bit of effort but I like the feel 440, 4-Speed, 3.54 1968, when Dinosaurs ruled the Earth

Re: Master cylinder question [Re: bobs69] #3180558 10/03/23 12:26 PM 10/03/23 12:26 PM
Joined: Jan 2003 Posts: 2,915 A shed in England Tig master
Tig master Joined: Jan 2003 Posts: 2,915 A shed in England	Swapped from a 1 1/32 to a 7/8 bore. It was way better, no more both feet braking on the 140mph + short shut downs . For info we have Wilwoods all round. '74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials. 9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge. RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03

Re: Master cylinder question [Re: bobs69] #3180588 10/03/23 01:54 PM 10/03/23 01:54 PM
Joined: Aug 2003 Posts: 43,157 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,157 Bend,OR USA	The smaller bores, under 1.0 in diameter, stop better than the larger ones over 1.0 inch diameter, way better the smaller you make them Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Master cylinder question [Re: bobs69] #3180701 10/03/23 07:46 PM 10/03/23 07:46 PM
Joined: Dec 2005 Posts: 11,551 Fulton County, PA C CMcAllister Mr. Helpful
CMcAllister Mr. Helpful C Joined: Dec 2005 Posts: 11,551 Fulton County, PA	Originally Posted by bobs69 What master cylinder for 4 wheel manual disc? Thanks Depends. 2 piston? 4 piston? How many of each? How big are the bores? If the results don't match the theory, change the theory.

Re: Master cylinder question [Re: Cab_Burge] #3180703 10/03/23 07:47 PM 10/03/23 07:47 PM
Joined: Dec 2005 Posts: 11,551 Fulton County, PA C CMcAllister Mr. Helpful
CMcAllister Mr. Helpful C Joined: Dec 2005 Posts: 11,551 Fulton County, PA	Originally Posted by Cab_Burge The smaller bores, under 1.0 in diameter, stop better than the larger ones over 1.0 inch diameter, way better the smaller you make them True. Will make more pressure than the large bores. But the reduced volume may make the amount of pedal travel unacceptable or unsafe. If the results don't match the theory, change the theory.

Re: Master cylinder question [Re: bobs69] #3180720 10/03/23 08:12 PM 10/03/23 08:12 PM
Joined: Jan 2003 Posts: 31,021 Oregon A AndyF I Win
AndyF I Win A Joined: Jan 2003 Posts: 31,021 Oregon	Originally Posted by bobs69 What master cylinder for 4 wheel manual disc? Thanks That is like asking what camshaft to use for a race engine. As luck would have it, the answer is the same. Use the one that matches the rest of the parts in the system.

Re: Master cylinder question [Re: AndyF] #3180735 10/03/23 08:46 PM 10/03/23 08:46 PM
Joined: Aug 2006 Posts: 813 ar. B bobs69 OP super stock
bobs69 OP super stock B Joined: Aug 2006 Posts: 813 ar.	Actually my question wasn’t about crankshafts. I know about engine building. Just bought this car with a bad master cylinder. Looking for a starting point with the brakes. If you can help thank you if not I don’t need the sarcasm. Thanks

Re: Master cylinder question [Re: bobs69] #3180834 10/04/23 07:31 AM 10/04/23 07:31 AM
Joined: Mar 2003 Posts: 2,498 PA moparacer top fuel
moparacer top fuel Joined: Mar 2003 Posts: 2,498 PA	Originally Posted by bobs69 Actually my question wasn’t about crankshafts. I know about engine building. Just bought this car with a bad master cylinder. Looking for a starting point with the brakes. If you can help thank you if not I don’t need the sarcasm. Thanks Like Cole said, you need to base your master cylinder size on your brake system volume. 67 Barracuda street/bracket car 11.27-119 68 Dart 502 BB 8.70s-152 414 cid SB Dragster 7.65-174

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