Why is the Bleed Order RR-LF-LR-RF?
06-28-2007, 01:23 AM
#1
Safety Car
Thread Starter
Why is the Bleed Order RR-LF-LR-RF?
The title says it all. Exactly why is the bleed order RR-LF-LR-RF vs the more common RR-LR-RF-LF, and why did the order change in the middle of the C5 run?
06-28-2007, 01:27 AM
#2
Tech Contributor
Member Since: Oct 1999
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Not sure but they may have changed to Dual Diagonal braking. That way if you lose one set of brakes you always have one front wheel and one rear wheel providing braking. Probably a little better than being left with either both fronts or both rears.
Bill
Bill
06-28-2007, 09:33 AM
#4
Race Director
06-28-2007, 01:21 PM
#6
Safety Car
06-28-2007, 01:24 PM
#7
Safety Car
Thread Starter
The 'old' order works okay for me as well, but there has to be a good reason for them to take the effort to point out the bleed order has changed...I'm just not sure what that reason is. Bill's post sounds reasonable, but I'd love to hear more.
06-28-2007, 01:47 PM
#8
Burning Brakes
Member Since: Jul 2004
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St. Jude Donor '10-'11
I'll put my money on this guy:
"Hi there,
The correct bleeding sequence is right rear, left front, left rear, right front.
That is for ZO6 and regular c6.
Allthebest, c4c5
My theory, and it is only that, is this sequence is this way due to fluid flow through the ABS modulator valve system.
Allthebest, c4c5"c4c5specialist
"Hi there,
The correct bleeding sequence is right rear, left front, left rear, right front.
That is for ZO6 and regular c6.
Allthebest, c4c5
My theory, and it is only that, is this sequence is this way due to fluid flow through the ABS modulator valve system.
Allthebest, c4c5"c4c5specialist
06-28-2007, 02:09 PM
#9
Race Director
also, the resevoir is separated for front year, so doing one of each sort of pre-purges half of the system before doing the other half.
Frankly, I pressure bleed my systems, and bleed every wheel twice. I do fronts, then rears, then rears again, then finally fronts. With the car in the air, wheels off, and drain pans under each rim, takes no time at all. I usually go through 2 full bottles of Synpower per flush and fill these days.
Frankly, I pressure bleed my systems, and bleed every wheel twice. I do fronts, then rears, then rears again, then finally fronts. With the car in the air, wheels off, and drain pans under each rim, takes no time at all. I usually go through 2 full bottles of Synpower per flush and fill these days.
06-28-2007, 04:07 PM
#10
Burning Brakes
The factory manual says: RR,LF, LR, RF. Why, I don't know. But that's what it calls for. I've been doing it that way since I got the car and I have never had a problem with the brakes on the track. So that's how I'm going to keep doing it.
06-28-2007, 04:42 PM
#11
Drifting
Question for you experts.
With only one brake reservoir, why would it make any difference how you bled the system as long as you emptied all of the old fluid???
With only one brake reservoir, why would it make any difference how you bled the system as long as you emptied all of the old fluid???
06-28-2007, 09:42 PM
#12
Safety Car
personally Ive been doing one side at a time left then right or vice versa.
06-29-2007, 03:14 AM
#13
Safety Car
Thread Starter
I figure I bleed this car so much I'd like to have an understanding why I'm using this bizarre bleed order.
06-29-2007, 07:39 AM
#14
Race Director
My research shows..............
VW made a big fuss about the safety advantages of having diagonal split braking systems in the 70's. I guess the Corvette has the same design
GM Engineers must want you to bleed the system in halves because modern brake systems are set up in halves, with each half doing a front caliper and the opposite side rear, that way if one corner is damaged and can't build fluid pressure, the other half of the system can still work a front/rear brake.
Mechanically I don't see why they'd think it was important though, to flush each half in sequence.......
They went to electronic proportioning and the sequence then changed to diagonal. RR (happens to be furthest) LF (is not the next furthest). Again to ensure the most complete replacement of old fluid with new, dictated by the dynamics of the plumbing/routing.
The difference being most engineering groups at the time work as independent sections vs as a system group..........and the folks drafting the maintenance manuals don’t know any better……….Does it matter..............well.............the physically farthest caliper to nearest has always worked for me........and all the others that have done it a lot on this Website no matter what year
FWIW…….During my drive train reinstallation on my 97' I tried reinstallation a different way cause It was just me doing it…………I installed just the torque tube 1st, then installed the tranny/rear end as an assembly by lifting straight up to avoid the ABS block in the rear on 97’s……….that worked great and wasn’t in the book either
VW made a big fuss about the safety advantages of having diagonal split braking systems in the 70's. I guess the Corvette has the same design
GM Engineers must want you to bleed the system in halves because modern brake systems are set up in halves, with each half doing a front caliper and the opposite side rear, that way if one corner is damaged and can't build fluid pressure, the other half of the system can still work a front/rear brake.
Mechanically I don't see why they'd think it was important though, to flush each half in sequence.......
They went to electronic proportioning and the sequence then changed to diagonal. RR (happens to be furthest) LF (is not the next furthest). Again to ensure the most complete replacement of old fluid with new, dictated by the dynamics of the plumbing/routing.
The difference being most engineering groups at the time work as independent sections vs as a system group..........and the folks drafting the maintenance manuals don’t know any better……….Does it matter..............well.............the physically farthest caliper to nearest has always worked for me........and all the others that have done it a lot on this Website no matter what year
FWIW…….During my drive train reinstallation on my 97' I tried reinstallation a different way cause It was just me doing it…………I installed just the torque tube 1st, then installed the tranny/rear end as an assembly by lifting straight up to avoid the ABS block in the rear on 97’s……….that worked great and wasn’t in the book either
