Rear Disc Problems

[DasPirate]

So last night, after the single most unfortunate series of events I've ever experienced, I finished helping 99_sl2 swap rear discs onto his ABS equipped 99 SL2. However, despite bleeding all brakes quite thoroughly (we must have gone through 2/3 of a large bottle of DOT3), his brakes were still alarmingly mushy. When I did mine, I didn't have to worry about the master cylinder draining out when I had the rear lines disconnected, but I'm wondering now if there's some differences with the ABS controller on the master cylinder, and if it needs to be bench bled or something. Any and all help is greatly apprecaited.

[SupraCharged007]

man I feel for you. My car has been through about 2 GALLONS of brake fluid in the last few months.

if you didnt have the lines open too long and the fluid in the mc never got too low, then you SHOULD not have to bleed the mc, or abs module.

what's prolly the cause is you have a leak somewhere.

Did you use new crush washers?
You might not see the leak, just put everything together, tighten it all up and bleed all four corners.

Clean off the calipers real good and take it out for a drive. Be careful and if the brakes just feel unsafe then just keep pumping them for a long ass time in the driveway. Keep checking all your fittings for any seapage.

if you get everything tight and nothing leaks and your absolutely sure that its not leaking. Then you are going to have to bring it to the dealer to have them bleed it with the Tec2 cause I don't believe there is a way to do it in the driveway without the scanner.
Good luck

[S.Bretz]

SOme cars do let you bleed them in the driveway...something about having to cycle the enginen one and off or put in and out of park to get the "bzzzzzzz" noice form the abs controller. That is suppose to be the contorller pumping the fluid threw....but I have never had to do one...I pinch the line with a round jawed vise grip if I know the line it gonna be off for a bit.


Yeah, you migh want to take it to a deal and get them to bleed it.

[DasPirate]

man I feel for you. My car has been through about 2 GALLONS of brake fluid in the last few months.

if you didnt have the lines open too long and the fluid in the mc never got too low, then you SHOULD not have to bleed the mc, or abs module.

what's prolly the cause is you have a leak somewhere.

Did you use new crush washers?
You might not see the leak, just put everything together, tighten it all up and bleed all four corners.

Clean off the calipers real good and take it out for a drive. Be careful and if the brakes just feel unsafe then just keep pumping them for a long ass time in the driveway. Keep checking all your fittings for any seapage.

if you get everything tight and nothing leaks and your absolutely sure that its not leaking. Then you are going to have to bring it to the dealer to have them bleed it with the Tec2 cause I don't believe there is a way to do it in the driveway without the scanner.
Good luck

No, no, we didn't go through that much brake fluid because it's leaking. I was saying that we used that much brake fluid because we practically replaced all the old fluid that was in all the lines. We were also quite thorough with bleeding the brakes. I'm 100% sure there's no leaks.

Unfortunately, because we had to run to the junkyard and back 4 times, the lines were left open for about 6 hours, and all the fluid bled out of them. On a car without ABS this would not have been a problem, as regular bleeding will eliminate all of the air, but I wasn't sure about the ABS dealie. I'll give Sean a call and let him know about the Tec2 option.

[therealm0rh0us]

.I pinch the line with a round jawed vise grip if I know the line it gonna be off for a bit..

+1
i thought it was to leave the key on

[99_SL2]

i hated life after this ordeal, everything that could have broke did


how much is it going to cost to get it bled with the tec2

[TimT]

Not sure if this helps BUT in my research for a bigger master cylinder I found out via the Bendix brakes web site that For ABS cars they call out for a differant master cylinder then non ABS cars. Also for cars with disc + ABS it has a different master cylinder. And not all years are the same. So now what I'm thinking is that there's something in the master cylinder that allows the ABS to function and move enough fluid to move the much bigger caliper piston (vs. the very small wheel cylinder)
The Bendix PN#'s for our cars are 13029, 12426,13500,13549.

Tim

[99_SL2]

well rear discs came on ABS equipped cars up until 99, which is what i have but since im 99 it came with drums..



maybe i need a different master cylinder since i didnt come with discs, but someone would probably have already pointed this out right?

[TimT]

Not sure I think everybody thought they were all the same. They look the same. Except for the 4 and 2 port models. I think its worth looking into.

Tim

[99_SL2]

also, bendix has same part numbers for 98 with discs and drums, do you have links for what you found?

edit: its also the same part number as my 99

[SupraCharged007]

97 was the last year for discs

[99_SL2]

yeah?

all the brake sites ive been looking at show discs stock on 98

[99_SL2]

bah, moot point.. same part numbers for 97 also..

[SupraCharged007]

the bore size on the master cylinder is the same between discs and drums. I honestly doubt there is a single thing different between the two master cylinders except the fact that the abs/disc mc has two ports and the non abs/drums has 4 ports.

[99_SL2]

what about the ABS/drums?