Brake master Cylinder

[SpudMurphy]

I see that vendors sell a replacement Brake master Cylinder which has a bias of 32 front / 68 back, and is stated as being the original type cylinders fitted to DeLoreans. Ironically a 50 / 50 bias cylinder is also offered.

Has anybody on here tried both cylinders?
If so what performed better ?
Thanks

[D Knight]

I have the 32/68 on mine and it stops like the original. No issues


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[SpudMurphy]

I have the 32/68 on mine and it stops like the original. No issues


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Thanks for the reply. The reason I'm asking is that I feel I have a brake issue. My car was bought as a project car. A previous owner fitted a non standard Lucas MC stamped FC2F 0795... A rare item with some but few hits on a search. I want to fit a replacement MC and wonder what would be the best bias MC to get, that would provide best performance.
I understand why a bias of 68 would be used what with the engine placement. But if people say that a 50/50 bias has provided improved braking then I'm all for that.

Both MC's are similar in price.

I'd appreciate responses relating to the MC as I have all other aspects of the braking system well covered -
Thanks.. I just don't want this thread sprouting arms n legs !!

[SpudMurphy]

Bump

[Rich]

The OE MC setup is fine.

In my experience the fronts lock up just before the rears do in a high speed max-braking situation. This is with OE F/R tire sizes, same make/model/tread/age tires F/R and an unmodified OE brake system

For a non-ABS system that's what chassis engineers strive for in a road car; nearly balanced F/R braking under this situation (thus min. stopping distance) yet without the rear end coming loose first once you "go too far".

[SpudMurphy]

The OE MC setup is fine.

In my experience the fronts lock up just before the rears do in a high speed max-braking situation. This is with OE F/R tire sizes, same make/model/tread/age tires F/R and an unmodified OE brake system

For a non-ABS system that's what chassis engineers strive for in a road car; nearly balanced F/R braking under this situation (thus min. stopping distance) yet without the rear end coming loose first once you "go too far".

Ok thanks Rich. Mine does not have an OE Master Cylinder on there ... a Lucas one that doesn't seem to be used by other DeLorean owners.

I'm thinking that changing the cylinder will help. So what with Dave's comments and now yours stating that the OE works pretty damn good if you are able to get the wheels locking - I Can't :-(

Was the OE version a 32/68 bias ?

[DMC-81]

Here is more discussion on the brake master cylinders: http://dmctalk.org/showthread.php?16595-50-50-vs-38-62-brake-master-cylinder

[Chris 16409]

Here is my take on the subject. All new brake masters sold by the vendors are made in China. Ultimately their service life will be shorter than the OEM part. I suggest you get a Brake Master off a 1979 Saab 99. They are generally made in Italy and will be of better quality. These are 50/50 bias however. They are also the least expensive option at around $80. If you'd prefer to keep it stock with the original bias, and get a quality part, then you need to talk to Rob Grady. He professionally rebuild the Brake Masters to better than new condition. His is the most expensive option but you will get a quality part.

[Delorean Industries]

Blanket statements are never a good thing.

___Our brake master cylinder bodies are cast in Southern Ohio. Engineered off an original Girling unit.

___ Our main body machine work is performed in Akron Ohio.

___ Our stainless ID sleeve is installed and honed to size in Akron Ohio.

___ Our plating is applied to the main body in Canton Ohio.

___ Our main internals are machined in Tallmadge Ohio.

___ Our internal seals are Cuyahoga Falls Ohio.

___The box that we put it in is manufactured in Ravenna Ohio.

___ Final assembly is in Tallmadge Ohio.


We have another batch in production now. We will also be offering a billet aluminum version as part of our SPEC brake package.

63970

[Rich]

I don't know the answer to your question here at the end.

I assume DMCL and Lotus knew what they were doing when they spec'd that design.


Ok thanks Rich. Mine does not have an OE Master Cylinder on there....So what with Dave's comments and now yours stating that the OE works pretty damn good if you are able to get the wheels locking - I Can't :-(

Was the OE version a 32/68 bias ?

[Chris 16409]

Blanket statements are never a good


We have another batch in production now. We will also be offering a billet aluminum version as part of our SPEC brake package

Thanks for the update Josh. This is great news. Had no idea you were producing these in the states. You’ll be the only vendor that does. Thanks for making quality parts.

[SpudMurphy]

What is the brake bias on the ones you manufacture Josh?

[Elvis]

We had a great meeting these days in Austria with >30 Deloreans, some even took part at a safty
driving class.

I filmed many and saw big differences in braking and handling.

Best car was one of Wolfgangs World Tour Deloreans. (front and rear same tire size, extra fuel weight
in the front...) Incredible stable handling !!! Not comparable at all to a stock Delorean !


All other cars - all of them in very good maintained condition - handled differently.

front brakes locking first,
rear ones locking first
all 4 locking together...

I am very curious what the best setup is for a (almost) stock car.

Does 32/68 ratio mean the rear brakes get more braking force ? or the front ones ?
Has anybody details about this including disc size, brake pads, tire size...?
Any car engineer here ? What do the theories say ?
Any tests done ? Videos ? Simulations ?

Thanks a lot,
Elvs & 6548

[SpudMurphy]

Does 32/68 ratio mean the rear brakes get more braking force ? or the front ones ?

Elvs & 6548

32 front 68 rear

I too am looking at the optimal mc for a stock brake set up?

[Delorean Industries]

Our cast units are stock bias and billet units are 50/50 for our brake system upgrade.

[SpudMurphy]

Our cast units are stock bias and billet units are 50/50 for our brake system upgrade.

Do you consider a 50/50 bias to be an improvement on the 32/68?

[Delorean Industries]

Not with a factory brake configuration. You should maintain the proper bias for how the system is designed. We change the bias along with other components for our specific requirements.

[BABIS]

Not with a factory brake configuration. You should maintain the proper bias for how the system is designed. We change the bias along with other components for our specific requirements.

from your experience, what is best with stock calipers and vented rotors?

[SpudMurphy]

Not with a factory brake configuration. You should maintain the proper bias for how the system is designed. We change the bias along with other components for our specific requirements.
Thank you Josh. Your info is much appreciated.
Based on your advice, I'll get a stock biased MC rated at 32/68 to replace the incorrect MC fitted.