what is the difference in a 50/50 and 38/62 Master cylinder? I seem to have a 50/50 in my car. Looking to rebuild the brake system. should I go back to the stock 38/62?
Location: Mebane, NC
Posts: 346
My VIN: 06668 81' Grey interior, 5 speed, Grooved hood. Previous owner of 16301, in 2001. Found Nov 2019, a
what is the difference in a 50/50 and 38/62 Master cylinder? I seem to have a 50/50 in my car. Looking to rebuild the brake system. should I go back to the stock 38/62?
The stock front suspension linkage (LCA, sway bar) is relatively weak. The 50/50 unit is from a Saab and while it works, it increases the braking load on the front brakes from 38 % to 50%. The original design is 38/62 because of the rear engine layout. It's up to you if you want to increase the load on the front under these conditions. I chose to stick with the stock configuration.
Dana
1981 DeLorean DMC-12 (5 Speed, Gas Flap, Black Interior, Windshield Antenna, Dark Gray)
Restored as "mostly correct, but with flaws corrected". Pictures and comments of my restoration are in the albums section on my profile.
1985 Chevrolet Corvette, Z51, 4+3 manual
2006 Dodge Magnum R/T (D/D)
2010 Camaro SS (Transformers Edition)
Dana
1981 DeLorean DMC-12 (5 Speed, Gas Flap, Black Interior, Windshield Antenna, Dark Gray)
Restored as "mostly correct, but with flaws corrected". Pictures and comments of my restoration are in the albums section on my profile.
1985 Chevrolet Corvette, Z51, 4+3 manual
2006 Dodge Magnum R/T (D/D)
2010 Camaro SS (Transformers Edition)
Location: Reedsburg, WI
Posts: 4,026
My VIN: 5180
Club(s): (DMWC) (DCUK)
Also the front caliper pistons are larger than the rear pistons. By reducing the pressure to the front calipers and increasing to the rear, you end up with a more balanced braking force pressure of the pads to the rotor.
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DENNIS
VIN 5180, Frame 3652, STAGE II, DM-eng Solid State Solutions (RPM Rly, Dm.Lt.Mod., Fan Fail Mod. , FAN Rly, HS.Rly) , HID headlights, SPAX user since 2009, Eibach springs, M Adj. Rear LCA's, DPNW poly-sway bar kit, DMCEU LCA Stabilizer link kit, DMCMW Illuminated door sills, Aussie Illuminated SS Shifter plate, REAL MOMO EVO Steering wheel, DELOREANA Extended View Side Mirrors w/ Heaters, DELOREANA LED Door Lights.
Posts: 605
What's the difference inside the Master Brake Cylinder ?
How is the 50/50 vs 32/68 done ?
Location: FL
Posts: 948
My VIN: Early
I switched to a Tesla master cylinder with a 50/50 bias, and my braking is a lot better than the original bias master. Also, lockup occurs almost at the same time in the front and back, so no issues there.
IMHO, all DeLoreans should have LCA brackets installed, either from Owen (spittybug) or Ed @ DMCEU. If stability is a concern, save a few $$ buying a 50/50 master and reinforce the front end down the road....
Early 81 5spd conversion- DMCH Ground Effects, Double Din, Custom Instrument Cluster, QA1 Suspension, 3.0 PRV with MS3
Cool. I'm all for modifications if that's what you want for your car. My point was that if you're going to stay stock with the suspension, then my opinion is that the stock BMC is advisable as that's what the car was designed for.
If you want to upgrade & strengthen the front suspension then sure, the 50/50 BMC is an option. The front would still be light however, so I don't see what advantage the increased bias provides. A side by side braking distance test would be helpful on that question.
Although, after seeing the front wheels flexing backwards slightly under braking both on video and in person, I would suggest upgrading the suspension first before installing a 50/50 unit.
Cheers,
Dana
1981 DeLorean DMC-12 (5 Speed, Gas Flap, Black Interior, Windshield Antenna, Dark Gray)
Restored as "mostly correct, but with flaws corrected". Pictures and comments of my restoration are in the albums section on my profile.
1985 Chevrolet Corvette, Z51, 4+3 manual
2006 Dodge Magnum R/T (D/D)
2010 Camaro SS (Transformers Edition)
Location: Northern NJ
Posts: 8,583
My VIN: 10757 1st place Concourse 1998
if you change the tire sizes then changing the bias might be warranted. The reason the bias is so important is you do not, under any conditions, want the rear tires to lock up BEFORE the front ones. Because the Delorean is a rear-engined car, it has a VERY high polar moment of inertia. What that means is if the rear wheels lock up the rear end will try to swing around quickly. More quickly than most drivers would notice in time to correct.
David Teitelbaum
Location: Mebane, NC
Posts: 346
My VIN: 06668 81' Grey interior, 5 speed, Grooved hood. Previous owner of 16301, in 2001. Found Nov 2019, a
Right, Because a skidding tire travels faster than a rolling tire.
I don't plan on changing tire sizes. I just was wondering why there were 2 different BMC. I have ordered a new stock style one and will be replacing it when it gets here. I have boxed in my LCAs just to help with stability too. as I have read that they are a weak point.