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303.02.0005.01 Knorr-Bremse compatible 4-Circuit Protection Valve Repair Kit

303.02.0005.01

Summary

This repair kit is designed for 4-circuit protection valves used in heavy commercial vehicle pneumatic brake systems. It ensures the restoration of pressure distribution across independent circuits. Compatible with Volvo (FH16, FM13, VNL), Renault Trucks (Premium, Magnum), and Mack (Pinnacle, Granite) heavy vehicles. Equivalent to OE Knorr-Bremse AE4603S1.

Product identifiers
EAN Code	8683457003200

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Compatible OEM Codes

KNORR-BREMSE
- K019911 S1
- K019909N00 S1
- K019908 S1
- K019907N00 S1
- II39775F S1
- II39140FM1 S1
- II39140F S1
- II38801F S1
- II37462N52 S1
- II37462 S1
- II37460N00 S1
- II36150 S1
- II36011N00 S1
- II3601105T S1
- II36011004 S1
- II36011 S1
- II33856 S1
- AE 4648 S1
- AE 4646 S1
- AE 4645 S1
- AE 4644 S1
- AE 4643 S1
- AE 4642 S1
- AE 4641 S1
- AE 4619 S1
- AE 4616 S1
- AE 4615 S1
- AE 4613 S1
- AE 4612 S1
- AE 4611 S1
- AE 4610 S1
- AE 4609 S1
- AE 4604 S1
- AE 4603 S1

Description

What does a 4-Circuit Protection Valve Repair Kit do?

A 4-Circuit Protection Valve Repair Kit restores the critical sealing and internal components of the valve responsible for distributing air pressure into four independent circuits: front axle, rear axle, parking brake, and auxiliary consumers. These kits are essential for maintaining the integrity of the pneumatic brake system in heavy commercial vehicles by preventing a leak in one circuit from depleting pressure in others.

Compatible vehicles and engines

This component is compatible with Knorr-Bremse systems and is widely used on Volvo trucks including FH, FM, and VNL models, as well as Renault Trucks such as Premium and Magnum. It is also fitted to Mack Pinnacle and Granite units. Other heavy vehicles like MAN, Iveco, and DAF may also utilize similar valve architectures.

Installation and maintenance

To ensure proper fitment, technicians should verify the part number on the existing valve housing against the required specifications. During maintenance, it is vital to inspect all seals and diaphragms to ensure they resist air system oils and temperature fluctuations. A complete overhaul with this kit restores the valve to its intended factory pressure balance and response speed.

Troubleshooting guidance

Regular inspection of the pneumatic system can prevent sudden pressure drops. If a leak is detected near the protection valve, a professional technician should check for worn internal components before full replacement of the unit.

OE cross-reference

303.02.0005.01 (4-Circuit Protection Valve Repair Kit) is the equivalent of the Knorr-Bremse OE numbers. This part directly replaces Knorr-Bremse OE numbers AE4603S1, AE4604S1, AE4609S1, AE4610S1, AE4611S1, AE4612S1, AE4613S1, AE4615S1, AE4616S1, AE4619S1, AE4641S1, AE4642S1, AE4643S1, AE4644S1, AE4645S1, AE4646S1, AE4648S1, II33856S1, II36011S1, II36011004S1, II3601105TS1, II36011N00S1, II36150S1, II37460N00S1, II37462S1, II37462N52S1, II38801FS1, II39140FS1, II39140FM1S1, II39775FS1, K019907N00S1, K019908S1, K019909N00S1, K019911S1.

Other OEMs

KNORR-BREMSE

AE4648S1
AE4646S1
AE4645S1
AE4644S1
AE4643S1
AE4642S1
AE4641S1
AE4619S1
AE4616S1
AE4615S1
AE4613S1
AE4612S1
AE4611S1
AE4610S1
AE4609S1
AE4604S1
AE4603S1
K019911 S1
K019909N00 S1
K019908 S1
K019907N00 S1
II39775F S1
II39140FM1 S1
II39140F S1
II38801F S1
II37462N52 S1
II37462 S1
II37460N00 S1
II36150 S1
II36011N00 S1
II3601105T S1
II36011004 S1
II36011 S1
II33856 S1
AE 4648 S1
AE 4646 S1
AE 4645 S1
AE 4644 S1
AE 4643 S1
AE 4642 S1
AE 4641 S1
AE 4619 S1
AE 4616 S1
AE 4615 S1
AE 4613 S1
AE 4612 S1
AE 4611 S1
AE 4610 S1
AE 4609 S1
AE 4604 S1
AE 4603 S1

Related Products

Used In

Compatible Vehicles

Compatible Vehicles
Brand	Model	Engine
DAF
IVECO
KNORR-BREMSE
MACK	Granite	MP7
MACK	Pinnacle	MP8
MAN
RENAULT TRUCKS
RENAULT TRUCKS	Kerax	DXi11
RENAULT TRUCKS	Magnum	DXi12
RENAULT TRUCKS	Magnum	DXi13
RENAULT TRUCKS	Premium	DXi11
RENAULT TRUCKS	Premium	DXi13
VOLVO
VOLVO	B11R	D11A
VOLVO	B13R	D13B
VOLVO	FH12	D12C
VOLVO	FH12	D12D
VOLVO	FH13	D13A
VOLVO	FH13	D13B
VOLVO	FH13	D13C
VOLVO	FH16	D16C
VOLVO	FH16	D16E
VOLVO	FH16	D16G
VOLVO	FM10	D10A
VOLVO	FM11	D11A
VOLVO	FM11	D11B
VOLVO	FM12	D12C
VOLVO	FM12	D12D
VOLVO	FM13	D13A
VOLVO	FM13	D13B
VOLVO	FM13	D13C
VOLVO	FMX	D11B
VOLVO	FMX	D13C
VOLVO	NH12	D12C
VOLVO	TAD1341-1345VE	D13
VOLVO	VHD	D12
VOLVO	VHD	D13
VOLVO	VNL	D12
VOLVO	VNL	D13

FAQ

How can I ensure this repair kit fits my vehicle?

To ensure correct fitment, always verify the part number located on the valve housing and confirm compatibility with your vehicle's chassis number before installation.

What role does this kit play in the braking system?

The kit restores the valve that distributes air pressure into four independent circuits, ensuring that a leak in one circuit does not compromise the entire pneumatic system.

Which vehicle brands are compatible with these kits?

These kits are compatible with Knorr-Bremse systems used in heavy vehicles such as Volvo, Renault Trucks, Mack, MAN, Iveco, and DAF.

When should I consider replacing the repair kit?

Technicians should look for signs of pressure loss or air leaks around the valve housing as indicators that the internal seals or diaphragms require renewal.

What are the OE reference numbers of this part?

303.02.0005.01 directly replaces Knorr-Bremse OE numbers AE4603S1, AE4604S1, AE4609S1, AE4610S1, AE4611S1, AE4612S1, AE4613S1, AE4615S1, AE4616S1, AE4619S1, AE4641S1, AE4642S1, AE4643S1, AE4644S1, AE4645S1, AE4646S1, AE4648S1, II33856S1, II36011S1, II36011004S1, II3601105TS1, II36011N00S1, II36150S1, II37460N00S1, II37462S1, II37462N52S1, II38801FS1, II39140FS1, II39140FM1S1, II39775FS1, K019907N00S1, K019908S1, K019909N00S1, K019911S1.