1970 GT lost brake fluid |
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garrincha
New Member Joined: 21-April-2019 Location: Munich, Germany Status: Offline Points: 7 |
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Posted: 21-April-2019 at 8:23AM |
After the winter break, it turns out my GT had lost most of its brake fluid. Pedal action was really lousy. After bleeding the air, looking at all four wheels with tyres off, and refilling the master cylinder, pedal action returned to normal. We followed the brake hoses (admittedly without taking everything apart) and they looked good. However, after a short test with full brakes on, forward and reverse - which worked good -, the master cylinder seemed to have leaked again. See photo. Would I be correct in assuming that the gasket in the cylinder could be a cause for this? |
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Christian 1970 Torino GT 302 |
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californiajohnny
Moderator Group Joined: 05-October-2013 Location: winlock, wa Status: Offline Points: 14606 |
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pull the rear brake drums and look at the cylinder at the top if it's wet the wheel cylinder is leaking also remove the 2 nuts holding the master cylinder to the booster pull it forward some, see if it's wet in the end of the booster? if so master is leaking...
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JOHN
74 GRAN TORINO S&H CLONE 74 VETTE CUSTOM 90 S10 BLAZER 4X4 LIFTED 77 CELICA CUSTOM 75 V8 MONZA SUPERCHARGED 79 COURIER VERT. SLAMMED 75 VEGA V6 5 SPD 70 CHEV C10 P/U 68 MUSTANG FB CONVERSION |
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garrincha
New Member Joined: 21-April-2019 Location: Munich, Germany Status: Offline Points: 7 |
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Thanks for the pointers John! With the wheels off, we didn't actually pull the rear brake drums (will need to do that on another weekend) but in any case noted absolutely zero wetness anywhere near the drum. Sufficient or insufficient visual evidence...? I ordered a replacement gasket just in case. But will make sure to look at the cylinder again!
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Christian 1970 Torino GT 302 |
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californiajohnny
Moderator Group Joined: 05-October-2013 Location: winlock, wa Status: Offline Points: 14606 |
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i believe you said you checked along the entire brake lines? no wet spots under the car? i've seen steel hard lines rust a pin hole in them, but sounds like it's leaking into the booster...
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JOHN
74 GRAN TORINO S&H CLONE 74 VETTE CUSTOM 90 S10 BLAZER 4X4 LIFTED 77 CELICA CUSTOM 75 V8 MONZA SUPERCHARGED 79 COURIER VERT. SLAMMED 75 VEGA V6 5 SPD 70 CHEV C10 P/U 68 MUSTANG FB CONVERSION |
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Big Bird
Senior Member Joined: 25-August-2013 Location: New York Status: Offline Points: 4194 |
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Does the brake line run under the car the whole way to the rear? I ask because my wife had a Mercury Zephyr and the brake line ran thru the interior in the back seat area. I know this because the car was losing fluid, and the leak was in the section under the back seat. Took forever to find.
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"What we do in full frontal view, is more honest than your cleaned-up mind."
Randy 1979 T-Bird 2005 F-150 STX RCSB 4.6, 3.55 LSD How the Heck does a REGULAR CAB SHORTBED weigh over 5200 pounds? |
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72FordGTS
Admin Group GTS.org Admin Joined: 06-September-2005 Location: Ontario, Canada Status: Offline Points: 5802 |
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The wheel cylinders may not be leaking much, so it's best to pull the drums,and inspect them closely (pull back the rubber dust boot to look for seepage). Regardless, fluid should not be coming out of the top of the master cylinder when the lid is on, so you might have a bad seal on the reservoir like you suspect. When my master cylinder went, it was leaking at the back and into the booster. So there was no signs of leaking on the outside.
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Vince
1972 Ford GTS Sportsroof - Survivor, One Family car GTS.org Admin |
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