Circuit Protection Valve Kits
Four-circuit and multi-circuit protection valve repair kits.
Circuit Protection Valve Kits
Circuit protection valves keep one failed brake circuit from emptying the others. The kits rebuild the internal diaphragms, springs and O-rings so each circuit holds its set pressure and the vehicle stays legal.
Makes covered in this section
WABCO, Knorr, Bosch, Isuzu, Nissan, Bendix, Actros
- 25 listed kits and components in this category
- Rubber parts moulded in-house in nitrile, EPDM, Viton or silicone to suit the fluid
- Pistons, shafts and adaptors machined on our own CNC lathes and mills
- Held in stock for ManuMark under JIT flexible manufacturing
Circuit Protection Valve Kits part list
Quote the ManuMark part number when you enquire. The catalogue carries the original valve numbers and alternate part numbers for each line.
| Description | ManuMark part no. |
|---|---|
| Slotted Plastic Ring | MM1680 |
| KNORR 4 Circuit | MM22288 |
| KNORR 4 Circuit c/w Piston | MM22288/1 |
| BOSCH 4 Circuit Valve | MM22289 |
| BOSCH 4 Circuit (5 Port) | MM22290 |
| BOSCH 4 Circuit (7 Port) | MM22330 |
| WABCO 4 Circuit | MM22499 |
| WABCO 4 Circuit | MM22499/1 |
| ISUZU 4 Circuit | MM33043 |
| BENDIX 4 Way Protection Valve | MM33079 |
| MAGNETT MARELLI 4 Circuit Protection | MM33084 |
| KNORR BREMSE Circuit Protection Valve | MM33132 |
| ACTROSS Circuit Protection Valve | MM33134 |
| Piston for MM33134 | MM33134/1 |
| ACTROSS Circuit Protection Valve | MM33134/2 |
| KNORR BREMSE 4 Way Circuit Protect | MM33141 |
| KNORR 4 Way Protection Valve | MM33147 |
| KNORR Multi Circuit Protection | MM33169 |
| WABCO 4 Cicuit Protection Valve | MM33176 |
| KBREMSE/BENDIX 5 Port Protection Valve | MM33186 |
| KBREMSE/BENDIX PISTONS FOR MM33186 | MM33186/1 |
| KNORR Multi Circuit | MM33204 |
| Flaps for NISSAN QUON / UD 410 | MM33210 |
| KNORR 6 Way Protection | MM33211 |
| FOTON 4 Way | MM33212 |
Other air brake repair kit categories
Air Dryer Repair Kits
Air dryer kits, adaptors and pistons for WABCO, KNORR and BOSCH air dryers.
Airmaster Repair Kits
Airmaster and air-over-hydraulic booster kits, pistons and shafts.
Brake Servo & Air Pack Kits
Repair kits for brake servos and air pack assemblies.
Calliper Repair Kits
Calliper seal and boot kits for air disc brakes across the major makes.
Calliper Pistons
Machined replacement calliper pistons for air disc brakes.
Clutch Servo Repair Kits
The largest section in the range: clutch servo kits, pistons, master cylinders and shafts.
Compressor Repair Kits
Compressor gasket, valve plate and unloader components.
Foot Valve Repair Kits
Foot brake valve repair kits for single, dual and multi-circuit pedal valves.
Foot Valve Pistons
Replacement pistons and plungers for foot brake valves.
Governor Valve Kits
Governor valve repair kits controlling compressor cut-in and cut-out.
Hand Control Valve Kits
Hand brake and trailer hand control valve repair kits.
Hydromaster & Hydrovac Kits
Repair kits for Hydromaster and Hydrovac vacuum boosters.
Load Sensing Valve Kits
Load sensing and load apportioning valve repair kits.
Solenoid & Miscellaneous Kits
Solenoid valve kits and the smaller items that sit outside the main groups.
Pressure Converter Kits
Air-to-hydraulic pressure converter repair kits.
Quick Release Valve Kits
Quick release valve repair kits for faster brake release.
Relay Valve & Modulator Kits
Relay control valve and ABS modulator repair kits.
Slack Adjuster Kits
Automatic and manual slack adjuster repair components.
Splitter Valve Kits
Gearbox splitter and range change valve repair kits.
Spring Brake & Actuator Kits
One of the biggest sections: spring brake, booster and actuator kits, shafts and caps.
Trailer Control Valve Kits
Trailer control and emergency valve kits, with and without dump.
Unloader Valve Kits
Unloader valve repair kits for compressor and air dryer unloaders.
Circuit Protection Valve Kits questions
How many circuit protection valve kits are in the ManuMark range?
There are 25 listed items in this category, part of the nearly 600 air brake repair kits in the ManuMark range. The full list with part numbers is on this page and in the downloadable catalogue.
Which makes do your circuit protection valve kits cover?
This category covers WABCO, Knorr, Bosch, Isuzu, Nissan, Bendix, Actros units among others. The catalogue cross-references original valve numbers and alternate part numbers so you can match an unbranded valve.
What is in a circuit protection valve kit?
Kits contain the moulded rubber seals, diaphragms and O-rings for the unit, together with the machined or pressed hard parts listed against that part number in the catalogue. Some pistons and shafts are supplied separately, which the catalogue notes against each line.
Which rubber compound is used?
The compound is matched to the fluid: nitrile for air, EPDM for brake fluid, Viton for mineral oil and silicone for heat applications. All rubber components are moulded in our own rubber department in Pinetown.
Are they made in South Africa?
Yes. The machined and moulded components are produced at our own factory at 32 Henwood Road, Pinetown, KwaZulu-Natal, and marketed under the ManuMark brand.
How do I order the right part?
Send us the ManuMark part number from the list on this page, or the number stamped on the valve, and we will confirm the correct kit before you order.
Who should fit these kits?
Air brake repair kits should only be fitted by qualified technicians with the necessary skill and expertise to ensure the kit's proper and safe operation. ManuMark kits are manufactured for use with unmodified OEM valves only.
South Africa
Circuit Protection Valve Kits supplied across South Africa
Manufactured at our own factory at 32 Henwood Road, Pinetown, KwaZulu-Natal. Choose your province to explore the cities and industrial areas we cover.