Bench bleeding the MC?

[jmpSHO]

How do I bench bleed the MC on a 95 ATX?

 

[AREA 91]

How do I bench bleed the MC on a 95 ATX?

Your new master cylinder should have come with 2 plastic fittings and hoses. You install the fittings and then route the hoses from the fittings up to the resivor.
Now put the master cylinder in a vice or other holding device by the metal body.
Fill the resivor bout 3/4 full. Now get yourself a screw driver and a rag.
Place the tip of the screw driver into the master cylinder where it would be engauged by the rod from the brake booster.
Place the folded rag over the end of the screw driver handle to protect your hand from the pressure.
Slowly push in the screw driver and release.
This will start the fluid flowing from the resivor, through the mc, and out the dischage lines and back to the resivor.
Repeat this process slowly until you see no more air bubbles coming from the lines.
Now install the mc onto the booster while keeping the bleeding fittings and lines in place.
After the mc is installed, remove the bleeding fittings and lines and install your brake lines.
Ta Da! You just did a mc swap.

 

[jmpSHO]

Your new master cylinder should have come with 2 plastic fittings and hoses. You install the fittings and then route the hoses from the fittings up to the resivor.
Now put the master cylinder in a vice or other holding device by the metal body.
Fill the resivor bout 3/4 full. Now get yourself a screw driver and a rag.
Place the tip of the screw driver into the master cylinder where it would be engauged by the rod from the brake booster.
Place the folded rag over the end of the screw driver handle to protect your hand from the pressure.
Slowly push in the screw driver and release.
This will start the fluid flowing from the resivor, through the mc, and out the dischage lines and back to the resivor.
Repeat this process slowly until you see no more air bubbles coming from the lines.
Now install the mc onto the booster while keeping the bleeding fittings and lines in place.
After the mc is installed, remove the bleeding fittings and lines and install your brake lines.
Ta Da! You just did a mc swap.

I'm actually going to bench bleed my old MC.

 

[AREA 91]

I'm actually going to bench bleed my old MC.

Use the same process for any mc. New, old, single, double, etc...

 

[jmpSHO]

Is there any way to bleed the MC without removing it from the vehichle? Thought I had seen it written before that you could? And if so how?

 

[AREA 91]

Is there any way to bleed the MC without removing it from the vehichle? Thought I had seen it written before that you could? And if so how?

Yes you can. Just bleed the brake's like you normally would. RR, LF, LR, RF.
This will take a while because the air bubbles will have to travel from: MC-ABS HCU-hard lines-soft lines-caliper-bleeder screw.
This will take about 2 quarts of brake fluid for the entire system.

P.S. A 1 man brake bleeder is your friend at this point.

 

[jmpSHO]

Ok thank you VERY much! Appreciate it!

 

[1bad98SHO]

You can bench bleed the Master cylinder on the car just like you would on the bench. Do the same thing you would do on the bench but with the master cylinder bolted to the booster. using the same technique that you would on the bench just work the brake pedal slowly. Take your time when bleeding the MC. Do not rush it or you will have nothing but problems and cant figure out why you cant get any fluid to the rear wheels.

 

[jmpSHO]

Am i supposed to disconnect the brake line then from the master cylinder if I want to bench bleed the MC still in the car???

 

[1bad98SHO]

yes. if you want to bleed just the MC then you would need to remove the lines. Do the same procedure as you would on the bench. You will then still have to bleed the brakes at the wheels after you are done bleeding the MC.

 

[hawkeye18]

Also, angle the car up as much as possible. You'll notice that the MC is at an angle to the plane of the car pointing down; bubbles float. You need to get the bubbles to the fittings or they'll never come out. This requires a fairly steep angle up; at the very least, jack the car up as much as you possibly can on the front.

 

[Roady94]

+ 1 ^

 

[jmpSHO]

Thanks!

 

[jmpSHO]

After a shit load of brake fluid and alot of time I finally got rid of the soft pedal and it stops better than it ever did. I appreciate everyone's advice in this thread.

 

[1bad98SHO]

glad that we could lead you down the right path.