brakes wont hold after sitting for 2 years and auto swap - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 11-23-2018, 09:09 PM   #1 (permalink)
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brakes wont hold after sitting for 2 years and auto swap

My junk has stock chevy dana 60 front brakes and my 14 bolt i did a disk brake conversion on. I decided to try the grand marquis master cylinder on the stock booster and it worked ok with the 4.0 and manual that was in it. But over the last 2 years its been sitting while i did a 5.3 swap along with an automatic. Now it barely can hold it at idle in 2H, when i backed it off my trailer i couldnt even stop it coming down with my foot on the floor. I have a proportioning valve on the rear line.
Im thinking i should do the 3/4 ton swap on the front, the 60 calipers were pretty rough looking when i put them on but they were free and i was on a budget at the time. Is it possible the booster went bad after sitting? I cant see a fluid leak at any connections on the lines. Not real sure where to go from here maybe i made a wrong choice on the grand marquis MC?

Thanks for any help.
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Old 11-25-2018, 07:26 PM   #2 (permalink)
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You still have brakes without a booster, think old school manual brakes just gotta push the pedal harder. If the pedal is going to the floor and you have no fluid loss (leaks) than likely your master cylinder is bypassing.
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Old 11-26-2018, 07:07 AM   #3 (permalink)
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Yeah it doesnt like pump up when you pump the pedal like theres air in the lines, its always kind of a soft pedal.
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Old 11-26-2018, 07:54 AM   #4 (permalink)
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First thing I'd check which seems stupid simple but I've seen it a few times in the past. Make sure your calipers are on the correct side, i.e bleeders at the top. If they are on the bottom you'll never bleed the air out. If calipers are correct and you're sure you have no external leaks (fluid loss) then it is your master cylinder.
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Old 11-26-2018, 08:16 AM   #5 (permalink)
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yeah bleeders are at the top, masters only got like 3 rides on it then it sat for 2 years and i didnt open the system, do they go bad if not used, shes still full of fluid has not dropped in the last day or so ive been driving it around.
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Old 11-26-2018, 08:54 AM   #6 (permalink)
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Have you bled them in the last 2 years? Could be air in lines.
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Old 11-26-2018, 01:59 PM   #7 (permalink)
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i have not since the first time, air shouldn't get in over time though i thought at least? all things equal and i had no leaks but maybe its worth a shot.

Anybody use a power bleeder? i hate brake fluid lol
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Old 11-26-2018, 05:31 PM   #8 (permalink)
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I have a vacuum bleeder. They are ok. Pressure bleeding works better IMO.

If you had a tiny leak, over 3 years there can be a lot of air in lines.
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