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Case IH 385 Brake Problem

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Author  [Modern View]

11-21-2020 18:44:22

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I have a Case IH 385. The right brake pushes to floor. I have changed the master cylinders, checked the steel tube in the drain hose on the reservoir and then changed the 3 o-rings for the brake piston. No fix.

When I go through bleed process and clamp off the reservoir drain hose, fluid runs through bleed valve with no air bubbles. When I push the pedal while bleeding, a surge of fluid comes through. So it seems to have air out and also seems the master cylinder is working since a surge of fluid comes through. However, when I close off the bleed valve the right pedal still goes to the floor.

Any suggestions what to check next?

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Mark Robke

11-22-2020 17:33:30

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 Re: Case IH 385 Brake Problem in reply to RNanno, 11-21-2020 18:44:22  
Try applying the brake with air: take the line off from the master cylinder at the axle. If it holds air, then the brake piston is ok and the problem is the master cylinder or the line from it, but the line would show a leak. It is easy to cut the o rings at the brake piston at the axle, and I would bet that is the problem. Mark.

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11-22-2020 07:01:56

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 Re: Case IH 385 Brake Problem in reply to RNanno, 11-21-2020 18:44:22  
Hi, this a test an old IH Mechanic used to perform, remove the hydraulic filler plug from behind the seat, with an air supply pressurize the brake line from the master cylinder to the rear axle and listen at the filler plug for air, this should be good on your 385 as you have replaced the O-rings, next was to disconnect the brake equalizer pipes and plug the fitting on the master cylinder and bleed and test the brake.

The other problem is the bushing on the brake pedal shaft when it becomes too worn when you press on the right brake the the actuator rod is pushed at an angle into the master cylinder and the hydraulic fluid leaks past the master cylinder piston.

See link to PA Farms IH Utilities, IIRC they did a youtube video on replacing the brake shaft bushings.

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11-22-2020 17:02:18

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 Re: Case IH 385 Brake Problem in reply to jimb2, 11-22-2020 07:01:56  
Thanks. That gives me a few more things to check.

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11-21-2020 19:16:58

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 Re: Case IH 385 Brake Problem in reply to RNanno, 11-21-2020 18:44:22  
A surge of fluid when no resistance is provided is different than when under pressure. The piston in the master cylinder may be collapsed and bypassing when asked to make pressure, not volume. Jim

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11-22-2020 17:04:54

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 Re: Case IH 385 Brake Problem in reply to Janicholson, 11-21-2020 19:16:58  
Thanks. I hope that is not it since I put a new master cylinder in. I may cap off the brake line to see if it is in the master cylinder.

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