Mr3plus1

iTrader: (5)

Finally got around to installing my 929 master cylinder.



The brake pedal feels awesome. I love it. Its a lot easier to regulate braking (although Im still getting used to it - I keep braking earlier than I need to).


Since I took the pic I removed the ABS for the rear brakes and installed a willwood proportioning valve. I still need to make the lines for the front brakes. No more ugly green lines. Just silver soon. And when Im done with the front the only lines on my firewall will be the vacuum line for my brake booster and the line for my front right caliper.

FDZero

iTrader: (10)

Awesome. I'll be changing' out my MC and SM soon too since my brake pedal is stickin'.

audiobot7

Looks Awesome. I was just thinking about doing this mod, but havent looked into it yet. Is it necessary to remove the rear abs?

Mr3plus1

iTrader: (5)

No. You can leave the ABS. Probably a better idea for a street car anyways. Im just removing it so I can run the dual wastegates for my manifold there and show them off. Hehe.

cabaynes

iTrader: (4)

For anyone who wants to do it, this is a great write up:

http://robrobinette.com/mastercylinder929.htm

audiobot7

Mr3plus1

iTrader: (5)

Id highly suggest this as an upgrade. Its a direct bolt on, but you're gonna need a pipe bender and a double flare tool. Both are cheap and easy to get. Save the fittings off your old lines because they're a bit hard to find (and why throw away something that you can re-use). And pep boys sells brake line by the 5' sticks. You need the smallest diameter one.

Even though I dont think it improves braking, it feels like it does because the pedal is so much more controllable and responsive.

CCarlisi

Interesting. Does it reduce the amount of force you have to put into the pedal for X amount of stopping power?

HobbeZ

no, i believe you have to put force to stop the car. The difference is in the distance u'll have to push the pedal... i think

Improved FD

bigger MC = more fluid moved per unit length of pedal travel...stopping power is the same, but feels more responsive

on my list of "to do", I already have the MC

KaiFD3S

iTrader: (37)

another thing I will need to do since I am upgrading my brakes...daym it, another thing to spend on.

audiobot7

turbojeff

iTrader: (30)

If you've got stock calipers this can be considered a performance *downgrade*.

A bigger MC will make pedal travel shorter and also reduce the amount of force the calipers clamp on the rotors for a given pedal force.

Improved FD

total bs....the clamping force is not reduced, the pedal travel is only reduced to move the SAME volume of fluid through the system

maxcooper

For the same clamping force, you will have to push harder. And travel will be shorter. The concept is the hydraulic version of grabbing a wrench closer to the nut.

I have never driven a car with stock calipers and a 929 master cylinder, but I don't think I would consider it a downgrade if you have decent (appropriate for your usage; i.e. track pads if you are on track) pads on the car. You only need mega-clamping-force after the brakes have faded. Having to push harder gives you some additional "resolution" for modulating the brakes.

-Max

Jack

iTrader: (2)

Ditto

Mr3plus1

iTrader: (5)

Has anyone driven a car with the stock brakes and 929 master? All those who say you have to push on it harder - it sure as **** doesnt feel like you do. Im barely tapping the pedal and the car will already start braking. ****, it doesnt move but 2" before it starts lockin up the tires, and it doesnt even feel as hard to push as my clutch. Maybe Im just crazy.

Sled Driver

iTrader: (9)

All that effort to "clean up" your firewall & you still have the cruise control system installed????

What, do you set the cruise to get consistant lap times?

You removed half (the rear only) abs?

I always thought is was all or none.
Heck, if you had a pick up, all you have is rear abs.

Whatever..............Nice polish job on the MC

DamonB

Unless you're God the principles of hydraulics still apply to you.

You're pushing on the pedal harder but you don't have to push it as far. There is not any mystery involved in this; it's very clear as the others have said.

Improved FD

let's face it, if there is a fractional increase in pedal force that must be applied, unless you have trouble squatting your own body weight at the gym, you are NOT going to notice ANY difference whatsoever in leg muscle effort, and pedal modulation is greatly improved....if you were pressing the pedal with your hand you *might* notice the difference

just do it

Improved FD

maybe some people on this forum have chicken legs

if you are complaining about brake pedal effort, I highly suggest you visit the local gym and get in shape

DamonB

Thanks for your advice but my brakes work just fine.

Nobody claimed that the increased effort would be strenuous, they merely claimed it exists. The 929 master cylinder has a larger bore than the stock one. It trades reduced pedal travel for increased pedal pressure.

Mr3plus1

iTrader: (5)

its 1/16 bigger bore. Look, Ive done it. Im no muscle man but Im no weakling. I keep hearing people saying that it increses force needed. Yes, it may. But will the average person notice a difference? I strongly doubt it. I daily drive my 7 and the only thing I noticed was difference in pedal travel. The extra effort required is a totaly useless point to be brought into this convo. Realisticly, the only thing you're going to notice is how little you have to move the pedal to effect braking, not that its harder to push on it.

Mr3plus1

iTrader: (5)

I commute to Houston several times a year. Until I move somewhere where Im not making a drive like that, cruise control stays.

And the ABS is only half removed because I havent had the chance to make the lines for the front brakes. All my tools are at the shop, and realisticly the only time I get to work on my car is before or after work (and maybe during lunch break). I just started removing it on Saturday. Before this weekend I'll have it all gone.

John Magnuson

I changed to the 929 brake master cylinder after I had already switched to larger aftermarket brakes so I can't really comment on how it changes the feel of the stock brakes. It did make a perceptable but NOT a big difference with my larger aftermarkets brakes compared to the stock brake cylinder.

Perhaps people that are experiencing a BIG improvement when changing to the 929 master cylinder are feeling the additional benefits of having replaced a worn original master cylinder or replacing old brake fluid which would cause a brake feel improvement above and beyond what the slightly larger master cylinder bore alone could create.