PR & PR Plus General Information
The Haldex Precision Response (PR & PR Plus) Height Control Valves (HCV) automatically add and exhaust
air from any air suspension to maintain a constant static design ride height. The PR line of HCV’s are
perfect for light to heavy duty applications and can be installed on rear air suspension, cab air suspension
and front air suspension applications. The PR and PR Plus line of HCV’s offer an array of fittings, manifolds
and integrated dump valve options. The PR and PR Plus HCV can be used in left or right hand installations
with short or long control arm configurations. The Haldex line of PR height control valves have an industry
leading deadzone, can operate in hot and cold environments and decrease air consumption
NOTE: The Haldex PR & PR Plus HCV(s) can be interchanged with other brands of height control valves.
Be sure to read instructions carefully for proper replacement and installation.
Before You Get Started
IMPORTANT: The HCV and linkage are designed to maintain the vehicle ride height as loads increase and
decrease. Proper setup of the PR and PR Plus HCV(s) is critical to system performance. Prior to any assembly
or disassembly, please read all instructions. Should you feel unable to properly perform the installation or
adjustments of a Haldex PR or PR Plus HCV contact Haldex Technical Services or have a certified mechanic
install or adjust the valve.
CAUTION: Incorrect installation of any HCV and associated components can impair suspension and
vehicle performance. It is extremely important that the original equipment manufacturer’s specifications of
a one or two HCV system be followed when installing an air control system. Refer to vehicle and suspension
manufacturer’s instructions for recommended valve location and ride height.
DO NOT install a single height control valve of any type if the suspension or vehicle manufacturer
specifies a two height control valve installation.
DO NOT use a time delay valve with a PR or PR Plus HCV on the same vehicle.
DO NOT use antifreeze or other solvents in an air supply line. Use of solvents or antifreeze can damage
seals and void the valve warranty.
NOTE: Conducting routine air system maintenance can help prevent any damage to air system
components. Never introduce foreign chemicals into any air system. Drain all moisture from air reservoirs
at regular intervals.
ALWAYS use a Pressure Protection Valve (PPV) and filter such as the Haldex Part Number 90554107.
Attach PPV directly to the air reservoir for supply to the PR & PR Plus HCV.
Installation
Guide
L31231 2/10
Figure 1
Installation Instructions for the
PR and PR Plus Height Control Valve
Reference Dimension Details for PR Plus HCV
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