SSDieselSupply.com
SSDPro-Exhaust.com
Results 1 to 5 of 5

Thread: Brakes go almost to floor

  1. #1
    Join Date
    Sep 2007
    Posts
    329

    Default Brakes go almost to floor

    Just today, my brakes started going almost to the floor. The pedal does come back up but pressure will not come back even by pumping the brake. Braking is extremely soft/non-existent until I push nearly to the floor. I am thinking it sounds like the master cylinder is bad but I just had the master cylinder and brake booster replaced within the past 6 months because they were leaking and I was very frequently adding power steering fluid. I haven't had any problems or noticed leaks since they were replaced, except I did add a little power steering fluid once or twice after parking on a slant.

    Any ideas or is it probably the master cylinder?
    1997 Silverado 1500 6.5. with 185,000 miles. New fuel injection pump at 132,000 mi. FSD Heat-Sync in bumper hole, marine fuel injectors, air induction kit all from Walt at 148,000 mi. Replaced OEM Fuel Filter Assy, wastegate solenoid valve, OPS and relay at 155,000 mi. Harmonic Balancer replaced. Red dot and White dot EGR replaced. New starter, Instant Heat glow plugs, and glow plug relay/controller at 180,000. Replaced hydroboost and master cylinder in 2016.

  2. #2
    Join Date
    Feb 2007
    Location
    Baja California Sur Mexico
    Posts
    2,804

    Default

    If no ABS light, then it is likely that one of the two main rubber seals has ruptured in the master cylinder. This happened multiple times to my 82 Chev, new kit each time, then had no problem for years.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban "F" VIN #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, Positrac 3.73 diff, 17 mpg highway.
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, 21 years.

  3. #3
    Join Date
    Sep 2007
    Posts
    329

    Default

    Thanks, I will keep that in mind. Also, my ABS light has been on most of the time for the 13 years I have owned the truck
    1997 Silverado 1500 6.5. with 185,000 miles. New fuel injection pump at 132,000 mi. FSD Heat-Sync in bumper hole, marine fuel injectors, air induction kit all from Walt at 148,000 mi. Replaced OEM Fuel Filter Assy, wastegate solenoid valve, OPS and relay at 155,000 mi. Harmonic Balancer replaced. Red dot and White dot EGR replaced. New starter, Instant Heat glow plugs, and glow plug relay/controller at 180,000. Replaced hydroboost and master cylinder in 2016.

  4. #4
    Join Date
    Sep 2007
    Posts
    329

    Default

    Turned out to be a rusted brake line. It has been replaced and brakes are fine.
    1997 Silverado 1500 6.5. with 185,000 miles. New fuel injection pump at 132,000 mi. FSD Heat-Sync in bumper hole, marine fuel injectors, air induction kit all from Walt at 148,000 mi. Replaced OEM Fuel Filter Assy, wastegate solenoid valve, OPS and relay at 155,000 mi. Harmonic Balancer replaced. Red dot and White dot EGR replaced. New starter, Instant Heat glow plugs, and glow plug relay/controller at 180,000. Replaced hydroboost and master cylinder in 2016.

  5. #5
    Join Date
    Apr 2017
    Posts
    16

    Default

    I was going to suggest that maybe the rear slack adjusters had quit turning and the back brakes needed to be adjusted.
    It must have been a rear brake line that was leaking.
    On My truck, the PO had told Me that for some unknown reason the back brakes would back off.
    I pulled the rear wheels and drums.
    For whatever reason, someone had replaced the shoes and left off the little coil springs that goes between the shoe and the adjusters levers. On both sides.
    The adjuster levers were in there, pins and clips properly installed but without those coil springs the levers were riding on the lower side of the slack adjuster and when the brakes were applied it would turn the rowels the wrong direction. LOL
    I had some springs in My spring collection boxes, put those in and they now work as they should. LOL
    2000 Chevrolet K3500 crew cab and long box, auto trans
    Relocated PMD W no. 9 resistor, gauge tower, boost, Pyro and trans temp. enhanced shift controller.
    Home made aeroquip oil cooler hoses.
    Added on Glow Plug Relay with manual push button along with the factory GP controller.
    3-1/2" exhaust with 4" tip. Straight through, no muffler and not too loud at all.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •