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Raybestos 5977R Disc Brake Rotor - Front
| Brand | Raybestos 5977R |
|---|---|
| Position | Front |
| Center Hole Diameter | 3.094 |
| Center Hole Diameter | 78.600 |
| Conventional Or Drum-In-Hat Type Rotor | Conventional |
| Discard Thickness | 0.962 |
| Discard Thickness | 24.450 |
| Mounting Bolt Hole Circle Diameter | 5.500 |
| Mounting Bolt Hole Circle Diameter | 139.700 |
| Mounting Bolt Hole Diameter | 5.500 |
| Mounting Bolt Hole Diameter | 139.700 |
| Mounting Bolt Hole Quantity | 6 |
| Nominal Thickness | 1.035 |
| Nominal Thickness | 26.300 |
| Outside Diameter | 11.610 |
| Outside Diameter | 294.900 |
| Overall Height | 2.220 |
| Overall Height | 56.400 |
| Solid Or Vented Type Rotor | Vented |
| Stud/Lug Hole Quantity | 6 |
| Product line | R-Line |
| Fits | Chevrolet and GMC · 8 vehicles |
Vented design. Helps promote airflow for more consistent braking performance.
Conventional rotor. A straightforward disc brake rotor for standard replacement needs.
R-Line series. Raybestos value line with dependable everyday braking.
Cross-references Centric Parts 121.66008, DENSO Auto Parts 5023 and DuraGo BR5568 for the same application. See all 68.
Raybestos R-Line 5977R Front Brake Rotor
The Raybestos R-Line 5977R is a vented disc brake rotor built for front axle service on select Chevrolet and GMC K1500 trucks. With a 11.610-inch outside diameter, 6-lug mounting pattern, and conventional rotor design, it matches the dimensional requirements for 1988-1991 Chevrolet K1500 and 1988-1991 GMC K1500 front brake applications, except F44 Heavy Duty Chassis.
Key Features
- Part number 5977R from Raybestos R-Line
- Front disc brake rotor for Chevrolet K1500 and GMC K1500 applications
- Vented rotor construction for front brake use
- Outside diameter: 11.610 in. / 294.900 mm
- Nominal thickness: 1.035 in. / 26.300 mm
- Discard thickness: 0.962 in. / 24.450 mm
- Overall height: 2.220 in. / 56.400 mm
- 6 mounting bolt holes and 6 stud/lug holes
- Center hole diameter: 3.094 in. / 78.600 mm
- Bolt circle diameter: 5.500 in. / 139.700 mm
- Conventional rotor style, not drum-in-hat
Product Details
Raybestos R-Line focuses on dependable brake service parts for everyday repair work, and the 5977R follows that approach with a conventional vented rotor profile and OE-style dimensions. This rotor is specified for front use on 1988-1991 Chevrolet K1500 and 1988-1991 GMC K1500 trucks, excluding F44 Heavy Duty Chassis models. The size, bolt pattern, and center bore are matched to the listed fitment so the rotor aligns with the original brake setup on these trucks.
This part cross-references Centric Parts 121.66008 and DuraGo BR5568 for the same application. The Raybestos 5977R is also referenced by multiple aftermarket numbers, making it easier to verify replacement options when servicing Chevrolet K1500 front brakes or GMC K1500 front brakes.
Common Problems This Rotor Can Address
- Front brake pulsation caused by rotor wear or thickness variation
- Brake noise related to worn or heat-affected rotor surfaces
- Reduced braking consistency from a rotor below discard thickness
- Uneven pad contact on a damaged or warped front rotor
- Service replacement needs on 1988-1991 Chevrolet K1500 and GMC K1500 front brakes
Installation Notes and Tips
Verify the vehicle is a 1988-1991 Chevrolet K1500 or 1988-1991 GMC K1500 with front brake fitment and not an F44 Heavy Duty Chassis model before ordering. Inspect the hub, bearings, pads, and caliper hardware condition during rotor replacement, and measure rotor thickness after installation to confirm it remains above discard limits. Clean the rotor and hub mating surfaces before assembly to help prevent runout-related brake issues.
Quality Assurance
Raybestos R-Line brake components are built for service replacement applications with attention to fit, dimensional accuracy, and brake-system compatibility. The 5977R is a conventional vented front rotor engineered to meet the listed specifications for the confirmed Chevrolet K1500 and GMC K1500 applications.
| Year | Make | Model | Body Type | # Doors | Position | Notes |
|---|---|---|---|---|---|---|
| 1991 | Chevrolet | K1500 | Standard Cab Pickup | 2 Door | Front | Except F44 Heavy Duty Chassis; R-Line |
| 1991 | GMC | K1500 | Standard Cab Pickup | 2 Door | Front | Except F44 Heavy Duty Chassis; R-Line |
| 1990 | Chevrolet | K1500 | Standard Cab Pickup | 2 Door | Front | Except F44 Heavy Duty Chassis; R-Line |
| 1990 | GMC | K1500 | Standard Cab Pickup | 2 Door | Front | Except F44 Heavy Duty Chassis; R-Line |
| 1989 | Chevrolet | K1500 | Standard Cab Pickup | 2 Door | Front | Except F44 Heavy Duty Chassis; R-Line |
| 1989 | GMC | K1500 | Standard Cab Pickup | 2 Door | Front | Except F44 Heavy Duty Chassis; R-Line |
| 1988 | Chevrolet | K1500 | Standard Cab Pickup | 2 Door | Front | Except F44 Heavy Duty Chassis; R-Line |
| 1988 | GMC | K1500 | Standard Cab Pickup | 2 Door | Front | Except F44 Heavy Duty Chassis; R-Line |
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