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Old 09-13-2013, 01:20 PM   #1
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Hydraulic Parking Brake on '98?

Got a call from a Cincinatti 98 Alpine owner who says he's got a hydraulic oil leak coming from his parking brake.
Anybody w/a '98 that can tell me what kind of parking brake you have?
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Old 09-13-2013, 02:21 PM   #2
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We had a '99 that had a parking brake with a hydraulic cylinder that used pressure from the PS pump to compress the spring and release the parking brake. Never had a leak problem but the parking brake did not hold very well.
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Old 09-13-2013, 05:03 PM   #3
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Quote:
Originally Posted by EngineerMike View Post
Got a call from a Cincinatti 98 Alpine owner who says he's got a hydraulic oil leak coming from his parking brake.
Anybody w/a '98 that can tell me what kind of parking brake you have?

I am not sure on a 98, but I had a 99 and it was air activated. The Peterbilt shop in Cincinnati seemed to be familiar with this. Old trucker
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Old 09-14-2013, 12:11 PM   #4
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The basic operation of the hydraulic release is shown in Figure 2 of the Bendix TW-12 Service sheet.
The difference is that the Alpine uses a TW-11 control valve and the HR-1 relay operates a single transmission drum brake not the 2 axle brakes shown on the diagram. The Alpine also has a pressure switch connected to the TW-11 that operates the parking brake lamp on the dashboard. In fact I thought I had a leak in the control valve but it turned out it was the pressure switch that was leaking due to corrosion, so I would start with that.
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Old 09-14-2013, 03:52 PM   #5
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John- did you have luck finding a replacement pressure switch? If so, where, cost & part#?
Thanks for the doc, it explains operation very well. Mike
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Old 09-14-2013, 06:56 PM   #6
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Mike, I could not find an identical replacement but NAPA had one that fitted. It is part # 701-1606.
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