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Registered
Join Date: Feb 2003
Location: Mt. Lebanon, PA (Pittsburgh)
Posts: 702
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Intermittent Brake Loss 84 Carrera
Need help with solving a random issue with the brakes on an 84 Carrera. After driving the car for apx. 45 minutes, and when applying the brakes, the pedal will go to the floor with barely any braking left. If I pump the brakes they will build pressure after several pumps. Turning the car off and letting it sit for apx. 15-30 seconds and restart, the brakes are back with a proper pedal. I am not losing any brake fluid as the level in the master cylinder remains at full, no drop whatsoever. I am guessing this is some sort of vacuum issue. Open for any recommendations. Thanks in advance!
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Kevin 84 911 Carrera 71 911E Vintage Race Car 16 Ford F150 20 Subaru Crosstrek |
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10-07-2018, 04:58 PM
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Sounds like maybe air in the system.
Try bleeding the brakes, starting from the rear working to the front. Steve Last edited by freeform911; 10-07-2018 at 08:25 PM.. |
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10-07-2018, 06:33 PM
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Registered
Join Date: Mar 2001
Location: Marysville Wa.
Posts: 22,426
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Sounds like dragging calipers. Heat is conducted to the brake fluid, which boils and becomes vapor which is compressable. Cools down and becomes liquid again. Jack it up and see if any wheels are hard to turn.
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https://www.instagram.com/johnwalker8704 8009 103rd pl ne Marysville Wa 98270 206 637 4071 |
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10-07-2018, 07:27 PM
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Join Date: Jan 2007
Posts: 11,758
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10-08-2018, 01:37 AM
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/ˈpɔrʃə/ PORSH-ə Fan
Join Date: Sep 2014
Location: Lafayette, LA
Posts: 652
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Something very similar was happening on my '84. Mine was just as John said, sticking caliper wouldn't open up when off the brake pedal. My problem was the rear calipers. One side was barely sticking, but the other side was creating so much heat it was easy to tell something was wrong as the whole wheel was blazing hot.
I replaced the calipers and full fluid flush and no more problem.
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1984 ROW Carrera Sunroof Coupe Schieferblau 1982 US SC Targa Moosgrun 1977 US 911S Sunroof Coupe - SOLD |
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10-08-2018, 04:32 AM
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shh-the robot is sleeping
Join Date: May 2010
Posts: 501
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As others have said, start with bleeding the brakes / checking the calipers especially if it needs to be done anyway. If that doesn’t do it, then I would start looking at the master cylinder.
It may be as easy as old fluid / water in the fluid. Rebuilding the calipers is not that tough or expensive either. Most importantly- be careful driving it until you get it sorted!! Make sure you emergency brake is sorted!!
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'88 911 Coupe, 69k miles |
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10-08-2018, 06:51 AM
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Could be wheel bearing. when the wheel wobbles, opens the caliper to far. Stepping on the brake then takes a couple pumps.
Chris 89 Carrera |
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10-08-2018, 08:02 AM
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76 911S Targa
Join Date: Oct 2010
Location: Idaho
Posts: 1,150
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If John Walker is correct you will feel heat at the affected wheel after driving for a few minutes. If one wheel is hotter than the others, there is your culprit.
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76 911S, 2.7, Bursch Thermal Reactor Replacements, Smog Pump Removed, Magnecors, Silicone Valve Cover Gaskets, 11 Blade Fan, Carrera Oil Cooler, Turbo Tie Rods. |
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10-08-2018, 04:22 PM
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