Guys with Killer Brakes, what about Rears & Bias????

[alnukem]

I see all types of Big Front Brakes for our cars, but really don't hear about the Rear Brakes. Maybe I'm not paying attention. Is there a Reasonably priced option out there to match up to say C5Z06 fronts? Also, what about adjusting Front/Rear Brakes. Thanks!

[mike100]

When I bought my car, it had a whole box of uninstalled C5 brake parts front and rear. The previous owner was going to forego having an e-brake and do C5 calipers on the rear too, but all you get was a little thicker rotor mass and maybe .25" larger diameter in the back.

My feeling was that-
1) the C5 rear brake pad was the same size
2) The C4 has a more forward weight bias than the newer generations with the rear transaxle.

There didn't seem to be any gain to convert the rear brakes to something with the same size brake pad to me. That leaves the more exotic hub mods for the really trick brakes. Who knows how much the master cylinder can support, but C5 fronts still lock up on mine.

[-=Jeff=-]

Also the C5 rear caliper has a bit bigger piston, so the rear piston area comes into play as well..

Front to rear bias is based on, Rotor size, Pad Surface area and Piston Area

I plan to swap to a later Master cylinder with the DRM Bias Spring and C5 rear calipers (mainly because I am going to add a drum style eBrake)

[XfireZ51]

Having C6Z06 calipers front and rear, I have encountered no issues with brake bias using the stock master w the DRM bias spring. Car stops usually sooner than you thought it would. Haven't locked these up yet. Just no need to hit the pedal that hard. I need to be aware of the car behind me.

[secondchance]

I see all types of Big Front Brakes for our cars, but really don't hear about the Rear Brakes. Maybe I'm not paying attention. Is there a Reasonably priced option out there to match up to say C5Z06 fronts? Also, what about adjusting Front/Rear Brakes. Thanks!

alunukem,

I think the reason not hearing about rear brakes is due to parking brake solution needed to modify rear brakes. In order to covert the rear to C6 4 piston or after market 4 piston brakes, such as Wilwood or Brembo, one needs to come up with dedicated parking brake solution. This can be done with C5 parking brake kit offered by Street Performance (I think...) or mechanical spot brake. I have chosen the latter solution.

http://i658.photobucket.com/albums/uu303/byongyun/2013-06-09145051_zpsa228826c.jpg (http://s658.photobucket.com/user/byongyun/media/2013-06-09145051_zpsa228826c.jpg.html)

[alnukem]

Just for info, I have heard of people using later F-Body & C5 Master Cylinders. I am not saying these are better....I do not know, just saying that people have used them & seem to like them, with the inference, that they are better for unknown to me reasons. Thanks, Tim

[batchman]

Just for info, I have heard of people using later F-Body & C5 Master Cylinders. I am not saying these are better....I do not know, just saying that people have used them & seem to like them, with the inference, that they are better for unknown to me reasons. Thanks, Tim

The benefit of an F-body master is the 1" piston (vs 7/8" factory all c4). The thing that has stopped me from doing this is just as you mention, rear bias. My car suffers from understeer under braking and I'd rather continue with soft brakes than make that worse.

I have been unable to take the time to figure out how to put in the bias spring to see if helps or hurts.

Of course it took me until this year to realize I'd upgraded the front pads but not the backs - I'll be trying that update as soon as I figure out how to bed new pad types on a non-street car...

Later,
- Jeff

[FU]

The bias spring will calm down the understeer when braking. Try it... it's a cheap mod and if it dosen't do what I said . The spring can be easily removed .

My combo has C5 ZO6 brakes with Baer Eradispeed rotors and the bias spring. I like it.

[alnukem]

I bought a car & there was a line with a description that said

"C5 Z06 Wildwood Front Brakes w/Guido Movit Master Cylinder Bias Spring"

what/who is Guido movit?

PS........there was enough air in the lines to keep the global warming in check for another decade! Gotta wonder?

[alnukem]

The bias spring will calm down the understeer when braking. Try it... it's a cheap mod and if it dosen't do what I said . The spring can be easily removed .

My combo has C5 ZO6 brakes with Baer Eradispeed rotors and the bias spring. I like it.

Frank, some day we have to meet! What brakes are you running on the rear?

[USAZR1]

I bought a car & there was a line with a description that said

"C5 Z06 Wildwood Front Brakes w/Guido Movit Master Cylinder Bias Spring"

what/who is Guido movit?


Guido Frensemeyer,owner of Movit-DE
http://www.movitbrakes.com/en/produkte/

[WVZR-1]

The benefit of an F-body master is the 1" piston (vs 7/8" factory all c4). The thing that has stopped me from doing this is just as you mention, rear bias. My car suffers from understeer under braking and I'd rather continue with soft brakes than make that worse.

I have been unable to take the time to figure out how to put in the bias spring to see if helps or hurts.

Of course it took me until this year to realize I'd upgraded the front pads but not the backs - I'll be trying that update as soon as I figure out how to bed new pad types on a non-street car...

Later,
- Jeff

In '92 there were some changes made. The master has a larger bore 23.7mm vs 22.2mm for earlier. The pedal ratio also changed from 3.5 to 4.0 so you could do the math and see if competitively the change to the later master or 4.0 ratio would help in your particular case. The stroke in the rear of the master also changed but I'm not familiar with the effect that that might have.

Now the booster changed as well in '92 along with the push rod so I don't know what might be required to accomplish the pedal ratio improvement. I know that you would need the '92 pedal and the support bolted to the firewall that the pedals swing on. The booster push rod is different also and I don't know that it could be used with the earlier booster.

A 4.0 ratio and the 1" F-body master?

[XfireZ51]

In '92 there were some changes made. The master has a larger bore 23.7mm vs 22.2mm for earlier. The pedal ratio also changed from 3.5 to 4.0 so you could do the math and see if competitively the change to the later master or 4.0 ratio would help in your particular case. The stroke in the rear of the master also changed but I'm not familiar with the effect that that might have.

Now the booster changed as well in '92 along with the push rod so I don't know what might be required to accomplish the pedal ratio improvement. I know that you would need the '92 pedal and the support bolted to the firewall that the pedals swing on. The booster push rod is different also and I don't know that it could be used with the earlier booster.

A 4.0 ratio and the 1" F-body master?

Dave,

That's very interesting. This would appear to explain why I have not found a need to change my master while having installed the Z06 brakes front and rear.

[alnukem]

Guido Frensemeyer,owner of Movit-DE
http://www.movitbrakes.com/en/produkte/

Thanks for the Translation....looks like good stuff!

[edram454]

My car came with the grand sport brakes and a brake bias spring. Previous owner put hawk track pads on this car and it stops on a dime with no fade. I get lots of dust and squeals but it does stop very good.

ed ramos #3028

[batchman]

The bias spring will calm down the understeer when braking.

In '92 there were some changes made.

Cool news, thanks to you both. In my racing class brakes and master are open, and update/backdate is up for grabs so any C4 part is legal.

If I'm lucky the bias spring with more aggressive pads will give me enough rear brake to add a bias adjuster, which really is a rear brake limiter. My problem with the understeer comes from not enough rear brake. If that works then I could perhaps get the higher ratio pedal and/or bigger piston master, but I thought there was something funny about the brake warning light on the later (1 reservoir, right?) master.

I sense a mix/match attempt coming this off-season :salute:.

Thanks again,
- Jeff

[WVZR-1]

I'd be inclined to try the 4:1 pedal and pedal support and see if I could maybe construct the push-rod to booster so I could keep everything I had. The master cylinder bore change was 1/16" or thereabouts and if the 4:1 showed promise then consider the change to the later master. There's ASR to contend with so it would require substantial thought maybe. Then again maybe not.

I was with a friend at Carlisle who was shopping pretty hard for one of his customers cars and I looked harder than I normally do to see what was laying around and I saw nothing. The problem I anticipated having even if I saw one that was supposed to be later I had nothing to measure and compare to.

I'd think I'd try a buy from one of the salvage guys and request the support and pedal from a known '92+ and see if the booster push rod could be included with the sale.

Demps said he was parting a '91 and he thought he had them so he could take dimensions from his to compare to what you need/want.