The function of the rear bumper support blocks of the car
The rear bumper support block (also known as the rear bumper bracket) is an important component of the vehicle's rear structure. Its functions mainly lie in the aspects of supporting, fixing, buffering and transmitting force. Core function
Support and fixation of the rear bumper: As a key structural component connecting the rear bumper to the body frame or the complete vehicle body, it ensures that the bumper remains stable, does not loosen, or warps during driving.
Transmission and dispersion of collision force: In cases of low-speed rear-end collisions or rearward scraping, the support blocks can transfer the impact force to the more robust structures of the vehicle (such as energy-absorbing boxes and beams), reducing direct damage to the bumper itself and surrounding components (such as tail lights and exhaust pipes).
Buffer and energy absorption: Some support blocks are made of elastic materials or combined with foam buffer layers, absorbing energy through controlled deformation in low-speed collisions (5–15 km/h) to reduce maintenance costs.
Auxiliary functions: Some designs also serve to guide rainwater drainage, fix tail light trim panels, and maintain uniform assembly gaps.
Structural features and materials
Most support blocks are made of high-strength plastic, reinforced nylon, or metal, balancing lightweight and strength.
They are connected to the vehicle body through methods such as snap fits, hangers, and bolts, requiring elasticity and reliability in a wide temperature range (-30°C to 80°C).
Qualified support blocks must meet engineering standards such as radial tensile strength ≥ 120N and axial torsional strength ≥ 0.8N·m.
Actual impact
If the support block ages, breaks, or is missing, it may cause:
Tail light trim panels to loosen and water to seep into the trunk;
Abnormal sounds or local deformation of the bumper during reversing;
Expansion or detachment of the bumper or local warping after a minor collision.
Therefore, although it is not an obvious component, it is the "invisible skeleton" that ensures the safety and durability of the rear part.
Car rear bumper support blocks (also known as buffer support blocks, brackets, or hangers) are key small components connecting the bumper to the vehicle frame. Their main function is to prevent the bumper from shaking, making abnormal sounds, and participating in energy absorption during collisions. If they fail, common symptoms include:
Loose tail light trim panels, water seeping into the trunk;
Abnormal sounds or local deformation of the bumper during reversing;
Breakage of the support block itself, detachment of snap fits, or complete detachment.
Handling suggestions:
Confirm the type of damage
If it is only a snap fit breakage or loosening, a snap fit can be replaced separately.
If the support block itself breaks (such as a plastic bracket breakage), the bracket needs to be replaced as a whole.
Self-replacement feasibility
Simple replacement (such as snap fits or brackets): Suitable for car owners with strong hands-on skills, usually requiring the removal of some interior parts, tail lights, or bumpers, taking about 20–60 minutes.
Hydraulic support rods: Due to the internal high-pressure structure, do not attempt to repair them yourself; replace them directly and have professionals install them.
Replacement precautions
Be sure to match the original model: Different vehicle models have significant differences in the shapes, hole spacings, and snap fit structures of the support blocks, incorrect installation will cause abnormal sounds or detachment.
Clean the installation surface: Before installation, remove dirt, sand, and old glue residue to ensure the snap fits are securely engaged.
Re-tighten the screws: There are usually 3–5 M6 fixing screws on the upper part of the bumper, the recommended torque is 8–10N·m.
When to seek professional repair
The bumper itself deforms (not a snap fit problem)
Involving electronic components such as blind spot monitoring wiring, radars, and rearview cameras
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