90 vert L98

After installing a Hurst Line Lock on the Front brakes, and a C5 brake upgrade, six times we have tried to bleed the brakes....we have bled the master cylinder per the FSM, we have used the correct procedure acc. to the FSM, I bought a Motive Pressure Bleeder. better, but not right. Any ideas?

 

Bench bleed Master cylinder, then prime pipe at ABS.

Then start bleeding from right rear, then left rear, then right front and finally left front.

If you do not get fluid when bleeding rears you have to drive a couple of feet your car so it reaches 4mph and the valves at the ABS opens and you can start bleeding.

They recomend to use speedbleeders also.
And if using asistant to pucsh the pedal, do it slowly and not all the way down.
Good luck

 

The 90 manual as told to me says RF RR LR LF . Dont know if it matters...Another vote for speedbleeders. Make sure your connections are tight so youre not pulling in air.

 

.........a lot of m/c come with a (kit) few plastic attachments and some plastic lines that screw into the mc brake line ports for bleeding right on the car....screw in the correct plastic attachment/adapter into the m/c brake line ports, attach the plastic lines and loop them back into the m/c resovoirs that are filled with brake fluid, pump the brakes until no bubbles are seen, remove the hoses and adapters, reattach brake lines and bleed entire system per manual.....

 

I can give you a pair of speed bleeders if you like, PM me

 

Not sure the answer but, my friend had a Ford pickup truck. The brakes would not bleed. We opened the bleeder screw and found no fluid was coming out. We then disconnect the hose to the wheel cylinder. Again we found no fluid coming out. We finally traced it to a faulty ABS valve.
Do you have a strong stream of fluid coming out of the bleeder screws?

 

Guys:

Thanks for the replies. I have speed bleeders on all brakes. (Thanks, LD85) dI have plenty of clear, bubble free fluid coming out of all brakes. i have tried gravity method, the Motive pressure bleeder, etc. opening up speedbleeders into a plastic tube, no air is going in...strong stream. i have also turned the line lock on and off several times to try to get any air out of the solenoid and related parts.
we have been careful in bleeding, ie , pressing the brake slowly and hilding it, letting up, acc. to the manual, etc. we have spent hours bleeding. i have driven the car in between, in re abs recycle.

Kinkajou:What was meant by priming the ABS pipe? Where is that? I do have abs, and i am getting a message displayed on that, but i figured it was due to poor brake pressure.

thanks,

mark

 

The ABS unit will always give you a fault code. The wheel speed sensors will trigger every time you do a burn-out. I don't know if that is what your complaint is though?

 

Whats the main complaint of the brakes?

 

my complaint is that they are 'mushy' they work, but i have to pump it everytime i brake. i want them to be firm. They are about 50 percent better than before, but still not satisfactory

 

Is the Master cylinder new?

 

Whenever you change the Master cylinder (MC) or disconect the lines to the MC, it is recomended that you flush the prime pipe of the ABS System.
If you take a clos look to the MC at the drivers side, there must be a rubber line that connects there. This line goes to the ABS modulator.

The modulator is located at a compartment just behind the drivers seat.
If you open this compartment you will see a padding that you must remove to expose the ABS modulator.
This box like structure receives a lot of stainless steel lines that comes from the MC and goes to the 4 wheel calipers.
There is a little bleeder that is located at the midline that must be bleed first, it is called prime pipe. Please correct me if wrong on this.

Once you bleed this , you are supposed to proceed with each caliper.
One thing I did not notice is that you have a 91, and the procedure described was for a 94, so I am not really sure if you have a prime pipe. I suppose that you have one because you have ABS.

This is an ABS module that is on sale at Ebay, I just want you to look at the pictures, specially at the las one. You will clearly see the bleeder and the lines.
http://cgi.ebay.com/ebaymotors/93-CO...em190150424965
I hope that your car has something similar, or at least have a bleeder somewhere.

Good luck

 

MC is original. it was fine before i changed things.

THanks for the great info. I will check it out this weekend and see about bleeding that ABS pipe.

 

........mushy usually means air in line especially if ya have to pump the pedal...

 

Just went through that. Bleed the MC while its on the car, then go bleed your brakes again.

 

.......i just flushed my brakes and bled same 45 min ago and no change......flushed with standard dot 3 and flushed that out with synthetic which remains in the system....i HATE MY MF-ING CRAPPY BRAKES!!....

 

OK, going out on a limb here with a W.A.G. You say you have C5 calipers, could it be that the C4 master cylinder cannot push out enough fluid to give you a hard peddle? Maybe you will need to go to a C5 Master Cylinder?

 

Can you do that? Has it been done before?
What benefits would it carry?

I have not seen a C5 MC, is it very different?

 

I think lots of people have put c5 front brakes on their c4s without changing the MC.

im about to hire linda lovelace to suck on the brake lines...

 

....yes, they have and the only thing that was changed were the wheel components and not the m/c.....