How to bleed the abs pump ? (5 Viewers)

[stevenmichael]

I have a 97 lx450 . I'm having bake problems . My brake pedal is going all the way down and not stopping me very good . A few pumps of the pedal and it seems to be normal again but only for a short time. I can't find a leak . I'm going to get a master cylinder rebuilt kit Part Number: 044933D010 . Once I have it rebuilt and bleed I'm afraid the top pipe that goes to the abs pump is going to get a air bubble in it since the pipe is going straight down into the master cylinder . Once I disconnect the top pipe if even one drop comes out that's going to allow air into that line .and as soon as I start pumping the brakes its going to send that air bubble right into the abs pump . If I bleed the brake line at the wheel will I be able to pump out that air bubble from the abs pump ? I could not find a bleeder screw at the top of the abs pump . What is the best way to bleed the abs pump to make sure there is no air in it from rebuilding the master cylinder ? I was told it was good to make sure there was fresh brake fluid in the abs pump to keep it working properly . What is the best way to get all the old fluid out of the abs pump and new fluid back in it ? Thanks for your help .

 

[ppc]

The need for pumping of the brake pedal sounds like loose wheel bearings not the master cylinder.

A bad master cylinder would be when you apply the brakes but the pedal slowly drops to the floor because of leaking seals.

 

[stevenmichael]

The need for pumping of the brake pedal sounds like loose wheel bearings not the master cylinder.

A bad master cylinder would be when you apply the brakes but the pedal slowly drops to the floor because of leaking seals.

Yes its pedal slowly drops to the floor . Sorry I should have typed that out . Once it at the floor a few pumps of the pedal and it feels correct again but after a minute or to it does the same thing . Do you know how to bleed the abs pump ?

 

[Rwhat]

I usually drive on a gravel road or loose dirt and lock up the brakes so the ABS kicks on. I have the Autel MX808 and used that to bleed the ABS on my 2008 F350. Haven’t tried it on the LC.

 

[stevenmichael]

I usually drive on a gravel road or loose dirt and lock up the brakes so the ABS kicks on. I have the Autel MX808 and used that to bleed the ABS on my 2008 F350. Haven’t tried it on the LC.

Is there a way to add a on off switch to the abs pump so I can make it run without having to use a mx808 ?

 

[NeverFinis]

Yes its pedal slowly drops to the floor . Sorry I should have typed that out . Once it at the floor a few pumps of the pedal and it feels correct again but after a minute or to it does the same thing . Do you know how to bleed the abs pump ?

The Factory Service Manual (FSM) has the procedure for bleeding the ABS Brakes. The FSM for your year can be found in the resource section here.

Originally, it did take a special Toyota tool, which no one has. There are threads here to bleed brakes as well. For example, this thread

 

[Malleus]

@stevenmichael you want posts #52 & #53 from the link @NeverFinis posted above. In fact, all of page 3 of that thread is pretty good to know stuff.

 

[TheBussman]

All of the bad master cyls I've taken apart had too much bore damage for a successful rebuild even after honing. hopefully you have better luck. a reverse bleed will prevent any air form ever getting into the ABS and save you alot of time.

 

[stevenmichael]

All of the bad master cyls I've taken apart had too much bore damage for a successful rebuild even after honing. hopefully you have better luck. a reverse bleed will prevent any air form ever getting into the ABS and save you alot of time.

Thanks I found this video about reverse bleeding . I think this is going to be what I try first . I need it to be as simple as possible . What do you think of this kit ? Is there one you could recommend that might be cheaper but still good ? . Is there a way for me to test the rebuilt kit once I have it put back together ? Is there a pressure test I can do ? As far as the reverse bleeding should I just install the rebuilt master cylinder after I bleed it so no air is in the cylinder ? My main concern is because I'm taking the master cylinder off that top brake line that goes to the abs is pointing down and attaches to the top of the master cylinder . I know there is no way to keep air from getting into that line . While I'm pushing the fluid up from the wheel wouldn't I just be pushing that air in the line right into the abs pump ? Will any air that gets into the pump pass through the pump ? In the video he shows starting from the passenger side back wheel but to keep air being pushed into the abs pump should I pump the fluid from the front drivers side first and not comment that line going into the top of the master cylinder and while I'm pumping fluid up from the front wheel wait till fluid is coming out of the pipe and have a helper connect the line and tighten it up what the fluid is still being pumped ? Would that work ?