2 0 Mack AI Engine Brake $175 USD Used take off Mack ETEC Jake Head. Model 690B Quantity3ConditionUsedFits To Make(s)MACKFits To Model(s)AIPart Number032137Stock NumberRyd MODEL 690B MLS Number13048217CategoryEngine Brakes / Jake Brakes Last Updated7/15/2025 LocationFitchburg, MA, US Sold ByRydemore Heavy Duty Truck Parts (888) 519-___ SHOWNUMBERCall Seller Email Seller Save More Info