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What is this part?
- Thread starter silverWS6
- Start date
Tom488
Active Member
vacuum pump - used to supply additional vacuum to the brake booster when the engine isn't producing enough vacuum mechanically
Dusty1948
Ram Guru
It's called the Integrated Control Unit (ICU). It is used to store extra fluid released from the calipers during ABS mode operation. It uses a DC operated pump to clear the brake accumulator of brake fluid for proper ABS function. It also includes valves to modulate brake pressure during anti-lock braking, Brake Traction Control, and Electronic Stability on each wheel individually without any driver brake input.
Regards,
Dusty
2019 Ram 1500 Billet Silver Laramie Quad Cab 2WD, 5.7 Hemi, 8HP75, 3.21 axle, 33 gallon fuel tank, factory dual exhaust, 18” wheels. Build date: 03 June 2018. Now at: 042884 miles.
Regards,
Dusty
2019 Ram 1500 Billet Silver Laramie Quad Cab 2WD, 5.7 Hemi, 8HP75, 3.21 axle, 33 gallon fuel tank, factory dual exhaust, 18” wheels. Build date: 03 June 2018. Now at: 042884 miles.
Tom488
Active Member
Isn't the ICU up by the master cylinder? OPs picture sure looks like the vacuum pump to me. This is the service manual's photo:
That's the oil dipstick handle (yellow) at the very top of the factory picture.
Dusty1948
Ram Guru
If you go to Brakes, ABS, Description, in the DT service manual the green highlighted item 1 is in the approximate location of the front, left side of the engine. The text in the description does say it's located near the master cylinder. My copy of the service manual is missing all four figures which might explain some confusion, but I don't see a reference to a "vacuum pump."
Best regards,
Dusty
2019 Ram 1500 Billet Silver Laramie Quad Cab 2WD, 5.7 Hemi, 8HP75, 3.21 axle, 33 gallon fuel tank, factory dual exhaust, 18” wheels. Build date: 03 June 2018. Now at: 042884 miles.
Tom488
Active Member
Under Brakes, Base, Description, Description and Operation - component #7 is the Electric Vacuum Pump. Under Operation, it says, "The base brake system uses an electric vacuum pump for additional vacuum supply".
Dusty1948
Ram Guru
I agree. I see it and in the diagram you noted the device under question appears to be graphically represented. I was not looking at the Brakes Base, obviously. Now I'm not sure why they split the brake components up into two separate sections.
Sorry for any confusion.
Best regards,
Dusty
2019 Ram 1500 Billet Silver Laramie Quad Cab 2WD, 5.7 Hemi, 8HP75, 3.21 axle, 33 gallon fuel tank, factory dual exhaust, 18” wheels. Build date: 03 June 2018. Now at: 042884 miles.
Jumping on this thread because I have a question regarding this vacuum pump.
When i push and release the brake pedal it sounds like the vacuum pump either bleeds off extra vacuum or has a leak. Is it normal for this vacuum pump to make a noise after releasing the brake pedal. Have any of you noticed this on your trucks while parked?
One person posted about this around a year ago but there wasn't any follow-up on the thread.
Previous post: 2020 Ram 1500 Rebel hissing noise from seems to be vacuum booster
When i push and release the brake pedal it sounds like the vacuum pump either bleeds off extra vacuum or has a leak. Is it normal for this vacuum pump to make a noise after releasing the brake pedal. Have any of you noticed this on your trucks while parked?
One person posted about this around a year ago but there wasn't any follow-up on the thread.
Previous post: 2020 Ram 1500 Rebel hissing noise from seems to be vacuum booster
The hiss only lasts maybe 1-2 seconds at most and comes from the vacuum pump and not the brake booster (climbed in the engine bay while my gf hit the brakes). I must have never noticed it in the last three years of owning the truck.
rambo57bts
Member
I'll jump in on this as well. So this truck makes weird hissing sound as well. I'll pull into a parking space, put it in park and let off the brake pedal. Then like you said, there's about a 2 to 3 second sound that originates from under the hood area - like a hissing or like that of a hydraulic moving fluid through a hose. It's repeatable. The brakes and electric parking brake work just fine. Brake fluid level fine and no leaks. Thanks for those who posted pics of the electric vacuum pump and it's description. I suppose that's where the noise is from.
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