Tech

 

ATR HQ-WB Hydraulic Clutch Pedal Assembly Instructions

 

 Pre-Installation Notes:

Ensure you have the correct pedal assembly for your vehicle.

Early models (e.g., HQ) have a bolt hole spacing of 1 ¾” between the brake pedal and clutch pedal bolt holes.

Later models (e.g., HZ) have a spacing of 2 ¾”.

WB models include all three holes and can accommodate either early or late assemblies.

A hydraulic crimped braided line is advised between the master and slave cylinder. Line length will be dependent on gearbox / slave cylinder application.

 Parts Included:

Qty

Part

1

Hydraulic clutch pedal assembly

1

Top Bolt ½ x 6.5” UNC

1

Lower Bolt (Early ½ x 6” UNC)  (Late ½ x 4” UNC)

4

½” Washers

1

Wilwood Reservoir + Hose

 

 

Bore

Stroke

Volume (cu in)

5/8”

1.12

0.34

3/4"

1.12

0.49

13/16"

1.12

0.58

7/8"

1.12

0.67

15/16"

1.12

0.77

1.00"

1.12

0.87


Installation Procedure:

 

  1. Remove Clutch Cables or Linkages
For manual vehicles with a factory clutch, disconnect and remove any remaining clutch cables or linkages.
  1. Remove Brake and Clutch Pedals
Remove the ½” brake pedal pivot bolt and allow the pedal to hang. If equipped, repeat the same process for the factory clutch pedal pivot bolt, and remove the clutch pedal.
  1. Install Pivot Bolts
Install the supplied ½” UNC bolt (6” long for early models, 4” long for late models) through the lower pivot hole first. Next, insert the ½” x 6.5” UNC bolt through the brake pedal pivot hole with the thread directed towards the centre of the vehicle.
  1. Install NPT Fitting
If using our clutch line kit, install the 1/8 NPT fitting onto the rear of the Wilwood master cylinder. Use pipe sealant or teflon tape on the tapered thread.
  1. Attach Clutch Pedal Assembly
Slide the clutch pedal assembly over the ½” UNC bolts. Some models may require placing a ½” washer over the lower bolt before the assembly is attached.
  1. Install Loose Clutch Pedal (If Applicable)
For models with a loose clutch pedal, slide the pedal onto the lower ½” UNC bolt. Follow by installing a ½” washer and a cone lock nut. Repeat this for the brake pedal pivot bolt.
  1. Snug Nuts Without Tightening
Tighten the nuts on both pivot bolts just enough to hold them in place, but do not fully tighten yet.
  1. Attach Push Rod to Pedal
Remove the ‘R’ clip from the pedal pushrod pivot. Remove one washer, slide the pushrod end onto the shaft, and then replace the washer and ‘R’ clip.
  1. Adjust Pedal Height
Check the clutch pedal height relative to the brake pedal pad. Tilt the assembly slightly up or down to achieve the desired height.
  1. Ensure Free Movement of Clutch Pedal
Avoid overtightening the lower clutch pedal pivot bolt. Check that the clutch pedal moves freely without binding.
  1. Check Pedal Throw
Verify that the clutch pedal has full travel without obstruction, such as carpeting or trim.
  1. Install Remote Reservoir

Choose a suitable location for the remote reservoir on the firewall or a similar surface. Connect the reservoir to the hydraulic line and route it to the master cylinder.

  1. Install Clutch Line & Bleed System

Install the clutch line, with a small amount of lubricant on the threads to prevent galling. Now bleed the hydraulic system. VT-VZ T56 slave cylinders require the roll pin to be removed, and the standard fitting replaced with the one supplied if using our line kit. Check for leaks and use only DOT 3, DOT 4, or DOT 5.1 brake fluids.