<!--[if gte mso 9]><xml> <w:WordDocument> <w:View>Normal</w:View> <w:Zoom>0</w:Zoom> <w:Compatibility> <w:BreakWrappedTables/> <w:SnapToGridInCell/> <w:WrapTextWithPunct/> <w:UseAsianBreakRules/> </w:Compatibility> <w:BrowserLevel>MicrosoftInternetExplorer4</w:BrowserLevel> </w:WordDocument> </xml><![endif]--><!--[if gte mso 10]> <style> /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman";} </style> <![endif]--> I am NOT a mechanic but have been restoring classic cars for 20 years and am very capable for doing most repairs. But I have a real bizarre one for you. I have a 02 Trailblazer LT 4X4 with 95k on it. It has an intermittent pulsation and a grumble in the brake pedal at very slow speeds. (2 to 3 mph) and the headlights dim only at those times. I could be doing 50 and hit the brakes anti-locks kick in and all is fine. It’s only when I’m in traffic at a crawl that this happens. Any ideas?
I’ve replaced brake pads, rotors, hardware, guides etc.TWICE!!!

 

Welcome to the forum. It sounds the signal from one of the ABS wheel speed sensor is dropping out, simulating the wheel locking up. Try to reproduce the symptom with the BRAKE fuse pulled from the rear fuse block temporarily. That would cut power to the EBCM and either eliminate or narrow it down to the ABS.