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Leaking air when pressing brake pedal discussion in ' trucks [ eighteen wheelers ] ' started by pro_leadfoot_operator, jan 23, 2023. A loss of air pressure can delay brake response time or even prevent the brakes from functioning altogether. However, like any mechanical system, the braking system can malfunction, leading to a range of problems, including air leaks when pressing the brake pedal.
The most obvious cause for this would be a leak in the system Leaks can occur in hoses, fittings, valves, or brake chambers, and they reduce the pressure needed to operate the brakes effectively Can you hear any leaks with the engine off
If not you might need to find someone to work the brake pedal while you check around/under the truck
If it is a leak, it should be easy to find with such a large drop in pressure. I have an air leak when pressing the brake pedal everything is functioning correct i think it might be a pressure swith switch it come directly from like a manifold that sits directly behind the brake pedal mechanic's assistant What's the make/model/year of your truck Its a 1997 freightliner classic /fld120 and has the detroit 60series mechanic's assistant.
Parking brake (yellow tractor air supply knob) set / pushed in and the brake pedal firmly pressed (this will require 2 people), walk around the truck or trailer and listen for a *hissing* noise. Start by shutting off the truck and releasing air pressure Depress the brake pedal to drain the system and bleed the air lines to avoid any loud noises during repair Use leak detection tools to locate the leaks and inspect all fittings and connections for signs of damage
Learn how to identify and diagnose air brake leaks in commercial trucks
Practical tips for leak detection and maintenance of air brake systems. Air leaks one of the most common problems in air brake systems is an air leak
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