1994 Dodge Shadow Front brakes not fully releasing

1994 DODGE SHADOW
180,000 MILES • 6 CYL • FWD • AUTOMATIC
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SPIKES32
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I have a problem with the front brakes overheating and releasing very slowly from a stop. I have changed pads, rotors and calipers with the same results (no brake pull however). The caliper pistons will not compress into the caliper unless the brake line is cracked slightly open at the banjo bolt. could this be a master cylinder or a proportioning valve problem? It seems to be worse in hot weather.
Jul 19, 2008 at 2:53 PM
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KHLOW2008
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Hi spikes32,

Thanks for the donation.

If both side calipers act the same, the possibility of hoses are reduced.

To test if it is PCV or master cylinder, release the pressure at each point respectively and compress caliper again.

If master cylinder is source of problem, check if the brake pedal to booster push rod clearance is sufficient.
Jul 19, 2008 at 3:15 PM
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MERLIN2021
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Also check for the hoses, are they cracked at the top near the bolt on the strut? If you open the bleeder or loosen the banjo bolt and the caliper will push in, the hoses can and in a 1994, prbably are the problem...unless the brake fluid is contaminated with oil, test it by putting a small amount of it in a cup of water, it will turn milky white with NO oil beads in it...if the oil beads appear your fluid is contaminated, and a sign of this is swollen rubber at the master cylinder seal...
Jul 19, 2008 at 7:37 PM
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SPIKES32
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Thanks for your suggestions. The hoses do not appear cracked or split near the stut mounting bolt. The pistons do compress when the banjo bolt or bleeder screws are loosened. The brakes seem to get noticeably hot when driving in hot weather, this maybe just a coincidence or I just notice it more then. The brake hoses make sense as the fluid would not be able to return to the master cylinder if they are restricted, but would allow pressurized fluid to the calipers. How could I verify that the master cylinder is not the problem, is there any way to check if it is returning fully?
Jul 20, 2008 at 9:18 PM
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MERLIN2021
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Crack the line at the master...and see if the calipers release.
Jul 21, 2008 at 2:33 AM
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SPIKES32
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Thanks for all your help. I found the problem and brakes work great. I cracked master cyl;inder lines and still couldn't compress the caliper piston; disconnected brake hose at he metal line and still couldn't compress the piston. both brake hoses were the culprit, changed them and have had no problems (better mpg now without all the drag).
Jul 25, 2008 at 9:18 PM
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MERLIN2021
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Glad we could help...
Jul 26, 2008 at 4:31 AM