MASTER POWER BRAKES PR4721K Brake Gm Cylinder Push Rod Kit

( Brand: Master Power Brakes ), ( Manufacturer Part Number: PR4721K ), ( Part Type: Brake Cylinder Rod ), ( Features: Adjustable ), ( Vintage Part: No )

Review MASTER POWER BRAKES Gm Brake Adjustable Push Rod Kit Mp

The **Master Power Brake PR4721K GM Brake Push Rod Kit** is a high-performance, precision-engineered component designed specifically for General Motors vehicles equipped with the GM Hydra-Boost or Power-Brake hydraulic brake systems. This kit is meticulously crafted to ensure optimal brake pedal feel, consistent hydraulic pressure, and reliable operation, making it an essential upgrade for enthusiasts and mechanics seeking to enhance their vehicle s braking performance while maintaining compatibility with stock or aftermarket brake systems. The PR4721K features a robust, durable push rod constructed from high-grade steel, engineered to withstand the demands of daily driving as well as spirited performance applications. Its design incorporates a smooth, polished finish and a precise ball-and-socket joint, allowing for seamless articulation and minimal friction, which translates to a more responsive and engaging brake pedal. Whether installed in a classic muscle car, a daily driver, or a high-performance GM vehicle, this kit ensures that the brake booster s hydraulic force is efficiently transferred to the master cylinder, eliminating common issues like spongy pedal feel, excessive travel, or inconsistent braking power. The PR4721K is fully compatible with a wide range of GM applications, including models from the 1970s through the early 2000s, making it a versatile solution for restorations, modifications, and routine maintenance projects. Built to exacting standards, this push rod kit is a testament to Master Power Brake s commitment to quality, offering a reliable alternative to OEM parts that may wear prematurely or fail under heavy use. For those looking to restore factory-like brake performance or upgrade their braking system with confidence, the PR4721K is an indispensable component that delivers both performance and longevity.

### **Pros and Cons of buying a Master Power Brake PR4721K GM Brake Push Rod Kit**

The **Master Power Brake PR4721K GM Brake Push Rod Kit** is a popular aftermarket replacement part designed for General Motors vehicles with power brake systems. Here are its key advantages:

1. **Direct OEM Replacement** This kit is engineered to match the specifications of the original equipment manufacturer (OEM) push rod, ensuring proper fitment and functionality. It is designed for GM vehicles with the **PR4721K** brake booster, which includes models like the **Chevrolet Impala, Caprice, Monte Carlo, and some Cadillac and GMC trucks** from the late 1980s and early 1990s.

2. **High-Quality Materials** Master Power Brake is known for using durable materials, including hardened steel and precision-machined components, which helps prevent premature wear and failure. The push rod is designed to withstand the forces exerted during braking without bending or breaking.

3. **Compatibility with Common Brake Systems** Since this kit is designed for GM vehicles with the **PR4721K booster**, it is compatible with standard hydraulic brake systems, including those with **Tandem Master Cylinders** (TMC). This makes it a straightforward upgrade or replacement for vehicles that may have worn or damaged push rods.

4. **Easy Installation** The kit typically includes all necessary hardware (e.g., nuts, bolts, and sometimes a new gasket) for a relatively straightforward installation. Many users report that replacing the push rod is a manageable DIY job, especially for those with basic mechanical experience. The process usually involves removing the brake booster, disconnecting the push rod, and installing the new one with proper torque specifications.

5. **Cost-Effective Solution** Compared to replacing the entire brake booster or master cylinder, replacing just the push rod is significantly cheaper. This makes it an attractive option for restoring proper brake function without a full system overhaul.

6. **Reliability for Everyday Use** For most drivers who use their vehicles for daily commuting, errands, or light off-road use, this kit provides reliable performance. The push rod is designed to handle typical braking loads without issues, provided it is installed correctly and maintained.

7. **Widely Available and Supported** Master Power Brake is a well-established brand with a strong reputation in the aftermarket brake industry. The PR4721K kit is easy to find in auto parts stores, online marketplaces, and through specialty brake shops. Additionally, Master Power Brake offers customer support and warranty coverage, which can be reassuring for buyers.

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While the **Master Power Brake PR4721K GM Brake Push Rod Kit** is a solid choice for many applications, there are some potential drawbacks to consider:

1. **Limited Compatibility** This kit is **exclusively designed for GM vehicles with the PR4721K brake booster**. Attempting to use it on a different vehicle (e.g., Ford, Chrysler, or non-GM models) will likely result in fitment issues or improper function. Always verify compatibility with your vehicle s specific brake booster model before purchasing.

2. **Potential for Misalignment or Improper Installation** If the push rod is not installed correctly such as being bent, improperly torqued, or misaligned with the brake booster or master cylinder it can lead to **spongy brakes, excessive pedal travel, or even complete brake failure**. This risk underscores the importance of following installation instructions carefully or seeking professional help if unsure.

3. **Wear Over Time** While the kit is durable, like all mechanical components, the push rod can wear out over time, especially in vehicles with aggressive braking habits or those driven in harsh conditions (e.g., heavy loads, off-roading, or extreme temperatures). Regular inspection of the brake system is recommended.

4. **No Upgrade in Performance** This is a **direct replacement**, not an upgrade. It will not improve braking performance beyond the original equipment specifications. If you are looking for enhanced braking (e.g., for performance driving), you would need to consider other modifications, such as a high-performance master cylinder or booster.

5. **Quality Control Concerns (Rare Cases)** While Master Power Brake is generally reliable, there have been occasional reports of counterfeit or subpar aftermarket parts sold under their brand. To mitigate this risk, purchase from reputable sellers (e.g., RockAuto, Amazon, or authorized dealers) and check for authenticity markings or packaging.

6. **May Require Additional Repairs** In some cases, the push rod may fail due to issues unrelated to the part itself, such as a **leaking brake booster, worn brake shoes, or a faulty master cylinder**. If these underlying problems are not addressed, the new push rod may not resolve all brake issues.

7. **Limited Longevity in Severe Conditions** Vehicles used in extreme conditions (e.g., frequent towing, heavy-duty use, or high-altitude driving) may experience premature wear on the push rod. In such cases, a more robust or reinforced push rod (if available) might be preferable.

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The **Master Power Brake PR4721K GM Brake Push Rod Kit** is a **reliable, cost-effective, and easy-to-install solution** for restoring proper brake function in compatible GM vehicles. It offers a direct OEM replacement with high-quality materials, making it a practical choice for everyday drivers who need a straightforward brake repair. However, its **limited compatibility, potential installation risks, and lack of performance upgrades** mean it may not be ideal for everyone.

For most **daily drivers, commuters, or light-duty vehicles**, this kit is an excellent choice if the vehicle s brake booster is confirmed to be a **PR4721K model**. If you are unsure about installation or suspect other brake system issues (e.g., booster leaks, master cylinder failure), consulting a professional mechanic is advisable.

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- Your vehicle is a confirmed **GM model with a PR4721K brake booster** (e.g., late '80s/early '90s Impala, Caprice, Monte Carlo, or similar).

- You are experiencing **spongy brakes, excessive pedal travel, or a push rod that is bent or worn**.

- You are comfortable with **basic brake system maintenance** or have access to a mechanic for installation.

- You want a **budget-friendly, direct replacement** without sacrificing reliability.

- Your vehicle s brake booster is **not a PR4721K model** in this case, you ll need a kit specific to your booster type.

- You require **enhanced braking performance** (e.g., for performance driving or heavy loads), as this kit does not offer upgrades.

- You are uncomfortable with DIY installation professional installation ensures proper alignment and torque, reducing the risk of brake failure.

- Always **verify compatibility** with your vehicle s exact brake booster model before purchasing.

- Inspect the **brake booster, master cylinder, and hydraulic lines** during installation to ensure no other components are failing.

- Follow the **installation instructions meticulously**, including proper torque specifications for bolts and nuts.

- If brakes remain spongy or unresponsive after installation, **bleed the brake system** to remove air from the lines.

In summary, this kit is a **strong, practical choice for its intended application**, but careful consideration of your vehicle s specific needs and your own mechanical comfort level is essential.

Details:

For sale is a new in the original packaging Master Power Brake Adjustable Pedal Push Rod Kit PR4721K. Includes, adjustable rod, clevis, pin and boot. The Master Power Brakes catalog list this kit as a GM Adjustable Push Rod Kit.

part #: pr4721k prices

• $139.79-$332.00

specifications pedalspadsaz:

• brand: Master Power Brakes
• mpn: Pr4721k
• part type: Brake Cylinder Rod
• features: Adjustable
• vintage part: No

payments pedalspadsaz:

• credit card: Mastercard
• wallet: Paypal
• other

general pedalspadsaz:

• Car Truck Parts Accessories > Interior Parts Accessories > Pedal Assemblies, Pads Parts
• condition: New

seller pedalspadsaz:

• city: Harrison Township, Michigan
• # reviews: 267
• rating: 100.0%

returns pedalspadsaz:

• policy: Returns Accepted
• paid by: Seller
• time: 30 Days

offer pedalspadsaz:

• sold: 0
• quantity: 1
• started: April 12, 2026
• options: Ship-to-home
• availability: In Stock

shipping pedalspadsaz:

• service: USPS Ground Advantage
• type: Calculated
• transit: 4-8 Days
• class: Standard
• carrier: USPS
• cost: $5.89

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