I have a `95 Lumina with ABS and rear drum brakes. It has 250 000KMs. Since I`ve had it the ABS light has been on. I haven`t had it scanned . I have replaced the pads and rotors, and rear shoes and drums (new, not turned). Recently I had to replace the master cylinder. The old one was leaking. I had the low pedal issue before and after all of this work. The shoes have been adjusted several times. Does the low pedal have something to do with the ABS? The car stops fine, just have to move the pedal about 5 inches.
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Honda had two brake reservoirs one on the normal brake master cylinder the other on the ABS module. If abs fuse has no power the module has no power. that power comes from the main fuses in underhood fuse box. the abs system is supplement system to normal braking system loss of brake pedal is a air problem or drum brake adjustment problem or a loose wheel bearing pushing the caliper piston back into caliper requiring more fluid to get brake to work causing a low pedal.
try bleeding your ABS block first, if that doesn not work could need a master or proportioning vavle. Some scan tools are capable of bleeding the ABS system on some vehicles, and some you have to bleed manually.
You have a leaky brake line somewhere. You will need to find and repair it. If you don't see any lines that are wet, you may have to pull the rear brake drums to check the wheel cylinders. They can also start to leak but are not as likely as a line. If your truck is a standard it's possible that your hydraulic clutch uses the brake master cylinder as a resevoir so check that line as well. A soft pedal would suggest that isn't the problem but if the fluid was low enough air could get into the lines. Hope this helps.
Is the problem your brake pedal is to low There is an adjustment for the brake light switch at the top of the pedal that could affect pedal hight slightly But if down a 1/2 inch or so i would suspect some kind of a problem with the brake system it self how well do the brakes stop the vehicleand have you noticed more of a drop in the pedal over time?
worn out pads or rotor, possible broken abs cable to brake. first check to see if all 4 are connected. all ore on back side of brake dust shield. than check to see if the brakes are worn last is the rotors. also see if there is a recall on the brake and battery re charge system.
Bleed right rear,left rear, right front, left front in that order to be sure of good bleed but the brake booster makes it easy to push pedal. Make sure of no leaks from master cylinder. Otherwise brake hoses being soft will also hurt baking quickly.
the ABS antilock braking system will if a fault occures? light up indicator light on dash but this means ABS is none operational thereby you will still be able to stop as if car not fitted with system i am conserned at your comment having to pump brake pedal? why? too much travel on pedal? but will pump up harder?? when you replaced front brakes? were the pads and discs replaced? did you bleed the brakes hydraulc system after ? from what you've said i am sure the ABS is working but a sensor /s is sensing premature brake lock up on either front or rear? so if you are certain front brakes ok? thencheck rears? if rear brakes are drums ? remove and inspect for wear or possible contamination ie cyl leaking fluid on shoes would cause brakes to adhese to drum on application also grabbing ? hope this helps some?
IT IS POSSIBLE THE WHEEL CYLINDERS are wrong and need too much fluid to push brakes out. or rear shoes are not adjusted correct. this could be from drums too big(unlikely since new) shoes are not fitting to drum correct.You can take shoes off and set them in drum the whole shoe should contact drum sometimes just the ends contact. If this is case sand off ends of lining to make it fit .
If wheel cylinders are bad they would leak. might try a different brand of cylinders.