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Mack Air Brake Compressor 1995-2000: OEM 303GB5114

MACK AIR BRAKE COMPRESSOR 1995-2000: OEM 303GB5114

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$1,895.00

CORE CHARGE:

$750.00
iCORE DISCLAIMER: The CORE charge is a 30 day hold and will not be processed as long as the CORE is returned within 30 days. If you do not have a CORE or fail to return the CORE within 30 days, the CORE charge hold amount will be processed at that time.

AVAILABILITY IN STOCK
OEM NUMBER 303GB5114
PART TYPE Air Brake Compressor
BRAND Tamerx Diesel Products
ENGINE MAKE Mack
ENGINE TYPE
YEAR 1995-2000
PART NUMBER 303GB5114RM

PRODUCT DESCRIPTION

This is a Remanufactured Tamerx Air Brake Compressor, Tamerx part number 303GB5114RM ( OEM Part Number 303GB5114 ). All parts are proudly remanufactured in the U.S.A. to the highest of OEM standards, and improvements are often applied to the original design in the remanufacturing process. This part is primarily made for a Mack , production years 1995-2000, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here

OEM NUMBERS

Primary OEM303GB5114
Additional OEM303GB5114, 5003728

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490542259
WEIGHT58.00 LBS

SHIPPING OPTIONS

Ship Weight : 58.00 LBS
UPS Ground, 2nd Day Air, Next Day Air

SHIPPING POLICY

Tamerx Diesel Products ships via UPS Ground. Next day air shipping can be arranged for a reasonable price of anywhere from $50.00 - $100.00 depending on the weight of the product and your location. We will do everything we can to make sure that you get the service you need. We understand how important it is to receive your order as quickly as possible.
In most cases Tamerx Diesel Products only needs one address, as long as your product is shipping to the same location as your billing information. In order to eliminate credit card fraud, your billing information must match the credit card you provide.

The terms, conditions, and details of our warranty vary from product to product. Specific warranty details can be found below.

Tamerx Diesel Products provides a replacement warranty on all of our parts. The duration and mileage limitations of the warranty vary by product and are specified on the product's detail page/item listing.

Please note that the warranty covers replacement of the part and the cost of shipping the replacement part to you only. It does not cover any shop, labor, towing, or any similar or related costs. This is not a "money back guarantee".

If you experience a problem with your part or it is not functioning properly, the correct warranty procedure is to call us at (510) 257-1777 (8:00 AM - 5:00 PM ET Monday through Friday). Be sure to have your order number and/or other relevant order information ready so we can easily locate your order and resolve your issue as quickly as possible. From that point, we will review with you any troubleshooting steps that may need to be taken and other areas or systems that can be checked to rule out external problems contributing to your part's issue. If a replacement is determined to be necessary, we will then arrange for your replacement part to ship out ASAP and issue any necessary return shipping labels and/or documents.

As is the case for the majority of the diesel products sold on Tamerx Diesel Products, your part's warranty is active as soon as you install it. In some other cases, warranty activation is contingent upon you sending us your core (i.e., your old part). Tamerx Diesel Products will provide you a return shipping label for parts that have a warranty with a core return condition. When we have received your core return, the part's warranty coverage begins. We reserve the right to void the product warranty if your core is not received within the allotted time, or if it isn't received at all. If the warranty for the diesel part you are purchasing has a core return requirement, it will be clearly noted on the product detail page/item listing.

What is a Core Charge?

A core charge (also called "core deposit") is similar to the deposit you might pay for a can or bottle of soda and is a standard requirement in the auto parts industry. For example, in many states, to promote recycling, you pay a deposit when you purchase a can of soda and receive your deposit back when you return the empty can. Many automotive parts have a core charge, or core price, that works in essentially the same way as a soda can deposit.

30 Day Core Charge Hold

You authorize Tamerx Diesel Products, to hold your credit card for the specified core charge amount and that you agree to return your core with 30 days of receiving the purchased part. When we have received your core return, the hold is released and the core charge payment is canceled.

The customer, or parts buyer, is responsible for any shipping costs associated with core returns unless otherwise specified in the product listing/detail page. Tamerx Diesel Products offers prepaid UPS shipping labels (SKU numbers UPS-CR1 and UPS-CR2) for use in returning your core that are available for purchase on our website during your shopping/order process.

The shipping label you will need to use for the core return is dependent upon what part you are purchasing. UPS-CR1 is good for cores weighing up to 20 pounds. UPS-CR2 is appropriate for shipping cores weighing 21 pounds or more. You must include enough information with the core return that clearly identifies it as a.) a Core Return, and b.) contains enough information we can use to clearly associate the core return with your order. Including a copy of the invoice or packing slip that came with the original shipment, clearly marked "Core Return", is ideal. Alternately, you can include a note marked as "Core Return" that includes your order number, full name and address, and phone number or other contact information. Failure to include this information with your returned core will most likely delay any due core credit being issued and/or delay any applicable warranty activation. Core returns need to be for the exact part purchased and cannot be damaged. Substituting another part in place of the part you have purchased is not acceptable.

All fluids must be drained.

If you have purchased a set or a parts package, you will need to return cores for all components of the set. For example, if you have purchaed a high pressure oil pump with an IPR valve, you will need to return both HPOP and IPR valve cores to receive proper credit. If you have purchased an EGR cooler/EGR valve package, your core return must consist of an EGR cooler core and an EGR valve core, or core credit will not be given.

Core Charges are often mandated by state legislature, and, as such, the actual core charge and taxes on the charge may vary depending on the state in which you buy your part. The Tamerx Diesel Products core charge presented to you online today with your item is representative of the most common core charge.


Step up your braking game with the Mack Air Brake Compressor (1995–2000) – OEM 303GB5114 — precision-machined to restore peak air pressure, safety, and reliability. Built to OEM specs, this compressor ensures rapid response and consistent performance under heavy loads and tough conditions. Swap it in, breathe easier, and drive safe.

FITMENT CHART

YEARMAKEENGINE(S)
1995Mack
1996Mack
1997Mack
1998Mack
1999Mack
2000Mack

PEOPLE ALSO ASKS | BLOG(S)

A reliable air brake compressor is foundational to safe heavy vehicle operation. For Mack trucks built between 1995 and 2000, the OEM 303GB5114 air brake compressor delivers steady, dependable air pressure to your braking system. When it begins to fail, you risk soft brakes, inadequate air pressure, or even brake lockups—all of which are unacceptable in demanding road conditions.

  • Generates compressed air for the secondary and service brake circuits, ensuring your brakes always have adequate pressure

  • Maintains proper air pressure recovery rate, allowing your system to respond quickly between stops

  • Built to Mack’s original design specifications, promoting fit, reliability, and longevity

  • Helps prevent common issues like air pressure starvation, compressor lag, or pressure drops while idling

  • Durable construction handles constant cycles, heat, and vibration typical in heavy-duty service

When your air system starts showing symptoms such as extended build times, low reserve pressure, or frequent warning lights, the compressor is often the first component to inspect. Swapping in a correct OEM 303GB5114 unit restores your braking system’s firmness, reliability, and safety. Don’t gamble with your brakes—trust in a compressor built to match the original standards.

The air brake compressor is a vital part of heavy-duty trucks and buses, providing the compressed air needed for safe braking. If the compressor isn’t working efficiently, it can compromise braking performance and safety. Regular testing ensures the system operates correctly and prevents unexpected failures on the road.

Steps to Test Air Brake Compressor Efficiency

  • Build-Up Time Test
    With the engine idling, time how long it takes for the air pressure to rise from 85 psi to 100 psi. It should take 45 seconds or less in most systems.

  • Governor Cut-In and Cut-Out Check
    The governor should cut in around 100 psi and cut out at about 125 psi. Deviations may indicate an adjustment or repair is needed.

  • Air Leakage Test
    With the system fully charged, turn the engine off and release the brakes. Loss should not exceed 2 psi per minute for single vehicles or 3 psi per minute for combination vehicles.

  • Compressor Cycling
    Monitor how often the compressor cycles during operation. Excessive cycling could point to leaks or a weak compressor.

  • Listen and Inspect
    Unusual noises, vibration, or visible oil leaks around the compressor can be early warning signs of inefficiency.

Testing an air brake compressor involves checking build-up times, governor operation, and air leakage to ensure the system meets safety standards. A well-functioning compressor helps maintain reliable braking, while early detection of inefficiency can prevent costly repairs and keep your vehicle safe on the road.

Some compressors draw oil from the engine lube system or require periodic oil checks in their own sump.

It typically draws ambient air (filtered) into its intake to compress for the brake system.

Keep intake filters clean, maintain proper lubrication, drain moisture, and avoid overworking it.

Yes — moisture can cause corrosion inside the compressor or in the delivery system.

Mack Air Brake Compressors

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