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Old 02-04-2018, 10:07 PM #31
Beaumont67 Beaumont67 is offline
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Quote:
Originally Posted by eimkeith View Post
I hear ya - professional car guy (shop owner) since '02; still have an issue with my 3rd gen brakes. - convinced it's the ABS pump...
Quote:
Originally Posted by 97t4r81 View Post
Not what I was hoping to hear. Oh well I love my rig enough to deal with it
My brakes (front & back) are fairly new (premium NAPA/UAP line) & I seem to get a soft brake peddle feel, only when I slow down enough to turn into my driveway, off the main highway....kinda weird.
- pedal always seems momentarily soft, unless I pump the pedal once / making the turn
- which should not be necessary / because my breaks are not hot, from normal drive home

I'm just driving home, and as I turn into my drive...I get the feeling, my ABS might be playing a trickery (on me).
- @ a certain point in lower mph braking
- been like this since took ownership, 7,500 Km / 5K miles ago
- rest of my driving, the pedal feel is adequate & firm enough / Gen3 like
- I know its gonna happen, when turning into drive / just bugs me though...doesn't make any sense

Last edited by Beaumont67; 02-04-2018 at 10:24 PM.
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Old 02-05-2018, 07:32 AM #32
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I think this could be normal. ABS is designed to kick in when the wheel speed sensors detect the wheels are turning at different speeds. If you have any slight wheel slippage when you are turning (gravel?), the ABS could kick in. When you do the turn, you must be on the brake pedal pretty firmly to feel the pedal sinking...(down hill?). Normally, I am braking ahead of my turn and then letting off pressure as I go around a corner. Also, maybe if you are making a very tight turn with brakes applied, the difference in speed between the outside and inside wheels could set off the ABS.

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Last edited by Buckaroo; 02-05-2018 at 07:42 AM.
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Old 05-09-2018, 11:35 PM #33
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Quote:
Originally Posted by m0ist View Post
Hey guys, love the forum and all the information in it. I have a question regarding a brake issue that I've had since I bought the car (about a month ago now).



The brake pedal sinks to the floor.



I started by replacing the following:

Front pads and rotors

Rear shoes and drums

Wheel cylinders

Brake fluid flush and bleed



Still the pedal goes to the floor.



Thinking it had to be the master cylinder, I replaced it.



Still, the pedal goes all the way to the floor. Everything was bled correctly.



The truck is equipped with abs. Is it possible that air got into the abs module somehow and it's screwing up my brakes?



Im just really confused at this point and I'm tired of throwing money at the dang brakes lol. Any help would be greatly appreciated!


Did you ever find a solution to this problem? I’m having the same issue!
I replaced the MC, gone thru about 2 gallons of brake fluid bleeding the lines. I haven’t messed with the spinner in the rear brakes yet.
I disconnected the abs connectors and pumped the brakes, no change. So maybe it’s not the abs pump?


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Old 05-09-2018, 11:49 PM #34
bwarren bwarren is offline
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Did you check the gasket between the MC and brake booster? Mine was totally shot when I replaced my MC. I think that was my issue rather than the MC, I was having similar issues.
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Old 05-09-2018, 11:56 PM #35
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Since you did replace the master cylinder, you probably have air in the ABS circuit. The right (not any) scan tool will allow you to properly bleed the ABS.
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Old 05-07-2021, 07:27 PM #36
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Quote:
Originally Posted by weezykid View Post
So I had a sinking pedal issue as I previously posted as well. At some stop lights the first pump would go very low with mediocre (at best) brake performance. At the stop I would lift the pedal and the next pump was firm like normal brakes.
After replacing most items in the system (most wear items were due) pads, rotors, shoes, drums, rear braided line (front lines arent very old), adjuster rear's tights (e-brake works as it should) and running a power bleeding through the whole system (after gravity bleeding and a normal pump-pump bleed procedure) Nothing really seemed to reduce or correct the sinking pedal. Up until last weekend I have just lived with it thinking the master and booster would be next.....
Well last weekend I finally got around to replacing most of my vacuum lines with the Silicone kit people have been ordering. I replaced every line I could see with silicone with the exception of some HD rubber lines (back of intake in 3 places and the booster line). There were also a few small lines I haven't done yet due to time. (one line running towards drivers side headlight, some lines towards the frame rails/possibly ADD)....

After replacing the vacuum lines with silicone I now have a firm brake pedal and have not had a sinking pedal for a week. So it seems as though my issue with a possible vacuum leak, weak line that may have been collapsing or one that was cracked that I could not see. Wanted to give this a week before reporting in, but these lines have helped my brake pedal issue.

So how do your vacuum lines look?
You may have hit on something here. I know this thread is older than mask wearing (not quite as old as sheep) but your words here gave me pause for this exact same problem I am having. 1988 4runner DLX 4x4 - new booster, mc, new rubber lines all around, new rotors and pads, no apparent leaks anywhere.....it doesn't make sense that the pedal goes to the floor like it does. I cannot stop the rig like I know I am supposed to. I maybe need to look into the vac lines to the booster. It's even been looked at by not one but TWO brake techs and they have fixed NOTHING. Anyone please help.
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Old 05-10-2021, 08:50 AM #37
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Quote:
Originally Posted by archcinco View Post
You may have hit on something here. I know this thread is older than mask wearing (not quite as old as sheep) but your words here gave me pause for this exact same problem I am having. 1988 4runner DLX 4x4 - new booster, mc, new rubber lines all around, new rotors and pads, no apparent leaks anywhere.....it doesn't make sense that the pedal goes to the floor like it does. I cannot stop the rig like I know I am supposed to. I maybe need to look into the vac lines to the booster. It's even been looked at by not one but TWO brake techs and they have fixed NOTHING. Anyone please help.
A master cylinder can leak into the brake booster without and external leak visible. The seals in a master cylinder can also go bad causing pressure to bypass the piston and not be forced to the calipers. A booster that isn't getting enough vacuum or that isn't operating correctly will give you a very stiff pedal. If you haven't replaced the master cylinder then that would be my suspect.
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Old 05-10-2021, 11:44 AM #38
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Quote:
Originally Posted by archcinco View Post
1988 4runner DLX 4x4 - new booster, mc, new rubber lines all around, new rotors and pads, no apparent leaks anywhere.....it doesn't make sense that the pedal goes to the floor like it does. I cannot stop the rig like I know I am supposed to.
During the first push of the brakes, doea the brake pedal hit solid at the bottom stroke and slowly sink to touching the floor?
Or is your brake pedal just low and not touching the floor as you hit solid at the bottom on the stroke?
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Old 09-25-2021, 08:03 PM #39
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Hate to be that guy to revive an old thread but man I’m getting desperate. Same issue but my 95’ 2nd gen has 4Wheel ABS which seems to a bit uncommon, i unplugged it, same thing. Replaced the MC, power brake booster, bled the system using every method possible, adjusted rear shoes. New pad and shoes, and rear wheels cylinders. The only thing someone mentioned was a possibility of vacuum leak. Tried spraying some brake clean around all the possible areas for leaks but still Nothing! This “cheap” off road project is getting pretty expensive… any help would be greatly appreciated.
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