o CNC Machined T6 billet aluminum direct fit firewall mounting plate design
o This model fits the  earlier GM "long rod / deep" master cylinder design
o All engines with PS pump on driver's side - compatible with rack and pinion conversions
o For use with disc / drum or disc / disc brakes (not for use with 4 wheel drum brakes)
o Features an adjustable brake pedal rod to allow for a range of brake pedal height adjustment
o Models with 4' / 6' PS line set include overlength hoses with re-usable / re-buildable hose ends  
o  7 1/4 " installed length from firewall to MC mounting flange - no firewall modifications required

1973 - 1979 Chevrolet / GMC C/K Truck Hydraulic Brake Assist Unit - Model # 3539

*GM deep vs. shallow master cylinder design:

"early / deep"                      "late / shallow"

NOTE: Part # 3039L is the brake unit itself without power steering line set. Part # 3039 is the brake unit with the 4' power steering line set
This model is identical in all ways to the 3539 model except for being equipped with the late / shallow style short MC pushrod 

1973 - 1979 Chevrolet / GMC C/K Truck Hydraulic Brake Assist Unit - Model # 3039

o CNC Machined T6 billet aluminum direct fit firewall mounting plate design
o This model fits the later GM "short rod / shallow" master cylinder design
o All engines with PS pump on driver's side - compatible with rack and pinion conversions
o For use with disc / drum or disc / disc brakes (not for use with 4 wheel drum brakes)
o Features an adjustable brake pedal rod to allow for a range of brake pedal height adjustment
o Models with 4' / 6' PS line set include overlength hoses with re-usable / re-buildable hose ends   
o 7 1/4 " installed length from firewall to MC mounting flange - no firewall modifications required

NOTE: Part # 3539L is the brake unit itself without power steering line set. Part # 3539 is the brake unit with the 4' power steering line set.
This model is identical in all ways to the 3039 model except for being equipped with the early / deep style long MC pushrod 

1973 - 1979 Chevy / GMC C/K Series Truck

SHOW PREPARED MODEL
SHOWN WITH PS LINE SET

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"early / long MC pushrod"                                               "late / short MC pushrod"  

®