LQ4 Hydro booster problems - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Bobbyh68 · 02-19-2019, 01:37 PM

I’m using a LQ4 out of a 06 Silverado HD that came with hydro boost from the factory. I’m having trouble adding it to my 1974 C30 Chassy. I’m using the original LQ4 pump, steering box from the c30, and hydro booster from a 2004 2500. Lines are ran correctly, I triple checked line placement with the junkyard, online research and my other LQ4 swapped truck in my garage. Everything looks correct.

My problem is that after a few minutes of test running my brake pedal is depressing (like someone is pressing it) and pump starts wining likes it’s under a heavy load, and lines are very warm to the touch and my steering fluid is burned.

Acts like a line is blocked or lines are routed wrong. Has anyone ever experienced this?

02-19-2019, 01:37 PM	#1
Bobbyh68 Registered User Join Date: Jul 2008 Location: Summerville SC Posts: 42	LQ4 Hydro booster problems I’m using a LQ4 out of a 06 Silverado HD that came with hydro boost from the factory. I’m having trouble adding it to my 1974 C30 Chassy. I’m using the original LQ4 pump, steering box from the c30, and hydro booster from a 2004 2500. Lines are ran correctly, I triple checked line placement with the junkyard, online research and my other LQ4 swapped truck in my garage. Everything looks correct. My problem is that after a few minutes of test running my brake pedal is depressing (like someone is pressing it) and pump starts wining likes it’s under a heavy load, and lines are very warm to the touch and my steering fluid is burned. Acts like a line is blocked or lines are routed wrong. Has anyone ever experienced this?



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